symbol

From French symbole, from Latin symbolus, symbolum (“a sign, mark, token, symbol, in Late Latin also a creed”), from Ancient Greek σύμβολον (súmbolon, “a sign by which one infers something; a mark, token, badge, ticket, tally, check, a signal, watchword, outward sign”), from συμβάλλω (sumbállō, “I throw together, dash together, compare, correspond, tally, come to a conclusion”), from σύν (sún, “with, together”) + βάλλω (bállō, “I throw, put”).

der

(crystallography) The numerical expression which defines a plane's position relative to the assumed axes.


regular

en-adj

regular (comparative more regular, superlative most regular)

more regular (comparative)
most regular (superlative)
reg'lar (alternative)
reg (alternative)
reg. (alternative)

/ˈɹɛɡ.jə.lɚ/

[ˈɹɛɡ.jɪ̈.lɚ]

From Middle English reguler, from Anglo-Norman reguler, Middle French reguler, regulier, and their source, Latin rēgulāris (“continuing rules for guidance”), from rēgula (“rule”), ultimately from Proto-Indo-European *reg- (“move in a straight line”).

register

not etymologically related but has semantic associations


pyramidal

LL-Q1860 (eng)-Naomi Persephone Amethyst (NaomiAmethyst)-pyramidal.wav

(geometry) Pyramid-shaped.
(crystallography) Tetragonal.


SC

en-noun

SC (countable and uncountable, plural SCs)

(crystallography) Initialism of simple cubic.


GB

(crystallography) Initialism of grain boundary.


cubic

From Middle French cubique, equivalent to cube + -ic.

cubic cleavage

(crystallography) Having three equal axes and all angles 90°.

مُكَعَّب

having three equal axes and all angles 90°


form

form (countable and uncountable, plural forms)

→ Korean: 폼 (pom)

→ Norwegian Bokmål: form

From Middle English forme (“shape, figure, manner, bench, frame, seat, condition, agreement, etc.”), borrowed from Old French forme, from Latin fōrma (“shape, figure, image, outline, plan, mold, frame, case, etc., manner, sort, kind, etc.”).
In sense "division grouping school students" (now dated), derived from public school nomenclature later adopted by state schools. It is sometimes said to be from the sense of "bench", where students of certain ages would sit together, though this is disputed, or alternatively from the sense of "established method of expression or practice".

der

imitation is the sincerest form of flattery

(crystallography) The combination of planes included under a general crystallographic symbol. It is not necessarily a closed solid.


lattice

→ Japanese: ラティス (ratisu)

From Middle English latis, from Middle French lattis (“lathing”), from Old French lattis, from latte (“a lath”), from Frankish *lattā, *lattu (“a lath”), from Proto-Germanic *lattǭ, *lattō, *laþþō (“board; plank; ledge”), from Proto-Indo-European *(s)latn-, *(s)lat- (“beam; log”). Cognate with Old High German latta (“lath”), (German Latte), Old English lætt (“lath”), Middle Low German lāde (“plank, counter, sales counter”), German Laden (“shop”). More at lath.

cog

(crystallography) A regular spacing or arrangement of geometric points, often decorated with a motif.


parameter

[pəˈɹæm.ə.ɾɚ]

/pəˈɾamˌiːʈə(ɾ)/

From French paramètre, from New Latin parametrum (“parameter”), from Ancient Greek παρα- (para-, “beside”) + μέτρον (métron, “measure”).

(crystallography) The ratio of the three crystallographic axes which determines the position of any plane.

(crystallography) The fundamental axial ratio for a given species.


immure

en-verb

immure (third-person singular simple present immures, present participle immuring, simple past and past participle immured)

immures (present singular third-person)
immuring (participle present)
immured (participle past)
immured (past)

From Middle English enmuren and Middle French emmurer, both from Old French enmurer, from Latin immūrō, from in- + mūrus (“wall”). Modern spelling is modelled after the Latin.

1975, American Institute of Physics, American Crystallographic Association, Soviet Physics, Crystallography, Volume 19, Issues 1-3, page 296,
On increasing the supercooling, the step starts completely immuring the impurity and v rises sharply.

(transitive, crystallography and geology, of a growing crystal) To trap or capture (an impurity); chiefly in the participial adjective immured and gerund or gerundial noun immuring.


motif

From French motif (1848), with the meaning of "main idea or theme". Doublet of motive.

(crystallography) The physical object or objects repeated at each point of a lattice. Usually atoms or molecules.


dome

Borrowed from Middle French dome, domme (modern French dôme), from Italian duomo, from Latin domus (ecclesiae) (literally “house (of the church)”), a calque of Ancient Greek οἶκος τῆς ἐκκλησίας (oîkos tês ekklēsías). Doublet of domus and duomo.

cal

οἶκος τῆς ἐκκλησίας

(crystallography) A prism formed by planes parallel to a lateral axis which meet above in a horizontal edge, like the roof of a house; also, one of the planes of such a form.


twin

PIE word
 *dwóh₁
From Middle English twinne, twynne, from Old English ġetwin, ġetwinn (“twin, multiple”, noun) and twinn (“twin, two-fold, double, two by two”, adjective), from Proto-Germanic *twinjaz, *twinahz (“two each”), from Proto-Indo-European *dwino- (“twin”), from *dwóh₁ (“two”). Cognate with Scots twyn (“twin”), Dutch tweeling (“twin”), German Zwilling (“twin”), Danish tvilling (“twin”), Swedish tvilling (“twin”), Faroese tvinnur (“a double set”), Icelandic tvenna (“duo, pair”), Lithuanian dvynys (“twin”), Russian двойня (dvojnja, “twin”).


zone

→ Korean: 존 (jon)

→ Punjabi: ਜ਼ੋਨ (zon)

From Latin zōna, from Ancient Greek ζώνη (zṓnē, “girdle, belt”).

der

(crystallography) A series of planes having mutually parallel intersections.


ortho-

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E.g. orthochrysotile is an orthorhombic chrysotile, orthopyroxene is a pyroxene that forms orthorhombic crystals, orthohexagonal is having orthorhombic hexagonal symmetry.

(crystallography) Orthorhombic crystal structure.


orthoclastic

en-adj

orthoclastic (comparative more orthoclastic, superlative most orthoclastic)

more orthoclastic (comparative)
most orthoclastic (superlative)

From ortho- + Ancient Greek κλαστός (klastós, “broken”) + -ic.

uder

(crystallography) Having cleavage planes at right angles, as in orthoclase.


orthometric

(crystallography) Having axes at right angles.


orthorhombic

/ɔː(ɹ)θəˈɹɒmbɪk/

A short form of the word pseudoorthorhombic; equivalent to ortho- + rhombic.

(crystallography) Having three unequal axes at right angles.

ortoròmbic

having three unequal axes at right angles


summit

PIE word
 *upó
The noun is derived from Late Middle English somet, somete (“head, top”) [and other forms], from Anglo-Norman sumet and Middle French sommet (masculine), somete, sommette (“top of a thing; highest point of a mountain”) (feminine) (modern French sommet), from Old French somet, sommette, from som, sum (“highest point, summit”) + -et (suffix forming diminutive masculine nouns), -ete, -ette (suffix forming diminutive feminine nouns). Som, sum are derived from Latin summum (“top, summit”), a noun use of the neuter of summus (“greatest, highest; top, uppermost”, adjective) (ultimately from Proto-Indo-European *upér (“over”) + *-m̥mos, *-tm̥mos (“suffix forming superlative adjectives”)). The modern English spelling was influenced by summity (“height or top of a thing; utmost degree, perfection”) (obsolete).
The verb is derived from the noun.

The topmost point or surface of a thing; the apex, the peak.

(crystallography, rare) One of the two vertices of a crystal with a rhombohedral shape where the angles of each face are equal; also, the highest point of a crystal with a pyramidal or tetrahedral shape.


polymorphism

en-noun

polymorphism (countable and uncountable, plural polymorphisms)

polimorfisme

crystallography: ability of a material to exist in more than one form

(crystallography) The ability of a solid material to exist in more than one form or crystal structure; pleomorphism.


sphenoid

From New Latin sphenoides, from Ancient Greek σφηνοειδής (sphēnoeidḗs, “wedge-shaped”), from σφήν (sphḗn, “wedge”) + -ειδής (-eidḗs, “-form, -like”).

af

(crystallography) A wedge-shaped crystal bounded by four equal isosceles triangles; the hemihedral form of a square pyramid.


diploid

From diplo- + -oid. By surface analysis, di- + -ploid.

(crystallography) Of a certain symmetry class with 24 congruent irregular quadrilateral faces.


dendrite

From Ancient Greek δενδρίτης (dendrítēs, “of or pertaining to a tree”). Equivalent to dendr- + -ite.

uder

(crystallography, metallurgy) Tree-like structure of crystals growing as material crystallizes


prism

→ Japanese: プリズム (purizumu)

→ Korean: 프리즘 (peurijeum)

→ Malay: prisma

→ Thai: ปริซึม (bprí-sʉ̂m)

[ˈpʰɹ̠̊ɪzm̩]

Learned borrowing from Late Latin prisma (“(geometry) prism”), from Ancient Greek πρίσμᾰ (prísmă, “anything sawn; sawdust; (Koine, geometry) prism”), from πρῐ́ζω (prĭ́zō) (a variant of πρῑ́ω (prī́ō, “to saw”), further etymology unknown) + -μᾰ (-mă, suffix forming neuter nouns denoting the effect or result of an action, etc.).

prizëm

transparent block used to reflect or refract light

(geometry) A polyhedron with parallel ends of the same polygonal shape and size, the other faces being parallelogram-shaped sides.

(crystallography) A crystal in which the faces are parallel to the vertical axis.


tetragonal

The eight normals of the tetragonal scalenohedron may carry the eight faces of a semiform in other ways than asymmetrically as regards the systematic planes.

1895, Nevil Story-Maskelyne, Crystallography: A Treatise on the Morphology of Crystals, page 255:

(crystallography) Having two equal axes and one unequal, and all angles 90°.

тетрагонален

having two equal axes and one unequal, and all angle 90°


trapezohedron

en-noun

trapezohedron (plural trapezohedra or trapezohedrons)

trapezohedra (plural)
trapezohedrons (plural)

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From trapezium + -hedron, with trapezium used in the US sense of a convex irregular quadrilateral.

The general form is called the tetragonal trapezohedron. In this case also there are both left- (Fig. 97) and right-handed (Fig. 98) forms.

1969, Carl W. Correns, translated by William D. Johns, Introduction to Mineralogy: Crystallography and Petrology, 2nd edition, page 40:

This trapezohedron, or antidiamond, is composed of ten quadrilaterals. In each quadrilateral, three of the angles are 108° and one is 36°.

2002, John Montroll, A Plethora of Polyhedra in Origami, page 105:

(geometry, crystallography) Any of a class of polyhedra that have kite-shaped faces and are dual polyhedra of antiprisms.

trapezopluredro

any of several forms of crystal with trapezia as faces

A trapezohedron has 24 equal faces, each a four-sided figure or trapezium. Unlike the forms already described, which are always the same, there are several different trapezohedrons, all having the same number of faces but differing in the angles between the faces.

1998, Cornelius S. Hurlbut Jr., W. Edwin Sharp, Dana's Minerals and How to Study Them (After Edward Salisbury Dana), page 23:

deltoidal icositetrahedron
deltoidal icositetrahedron

(crystallography) A deltoidal icositetrahedron.


zirconoid

From zircon + -oid, because this form often occurs in zircon crystals.

(crystallography) A double eight-sided pyramid, a form common with tetragonal crystals.


GBS

(crystallography) Initialism of grain boundary sliding.


hexagonal

(crystallography) Having three equal axes which cross at 60° angles, and an unequal axis which crosses the others at 90° angle.

хексагонален

crystallography: having three equal axes crossing at 60° and an unequal one crossing at 90°


asbestiform

(crystallography) Having a particular kind of fibrosity in which fibers have high tensile strength and flexibility


macrodome

(geology, mineralogy, crystallography) A dome parallel to the longer lateral axis of an orthorhombic crystal


macropinacoid

(crystallography) One of the two planes of an orthorhombic crystal which are parallel to the vertical and longer lateral (macrodiagonal) axes.


twinning

(crystallography) the formation of twin crystals


twin crystal

(crystallography) either of two separate crystals that share crystal lattice points in a symmetrical manner and intergrow


crystal twinning

(crystallography) The intergrowth of two twin crystals.


epitaxy

epitaxy (usually uncountable, plural epitaxies)

(crystallography) An overgrowth in which the overlying crystal is either induced into the same orientation, or otherwise grows under the influence of the underlying crystal into the same orientation.


monoclinic

(crystallography) Having three unequal axes with two perpendicular and one oblique intersections.


triclinic

(crystallography) Having three unequal axes all intersecting at oblique angles.

三斜

having three unequal axes all intersecting at oblique angles


space group

Dorothy also learned to identify the space group of a molecule, an essential prerequisite for finding the structure, by looking for spots that were missing from the regular array in an X-ray photograph.

1998, Georgina Ferry, Dorothy Hodgkin: A Life:

(crystallography, mineralogy) The set of all symmetry operations that can be applied to a given crystal without changing it.


crystal lattice

crystal lattice (plural crystal lattices)

(crystallography) A regular three-dimensional geometric arrangement of atoms, molecules or ions in a crystal


hemihedral

(crystallography, of a crystal) Having only half the plane faces needed for the highest degree of symmetry in its system


immured

en-adj

immured (comparative more immured, superlative most immured)

more immured (comparative)
most immured (superlative)

(crystallography and geology, of impurities in a growing crystal) trapped or captured (within the surrounding matrix).


form factor

(crystallography) A function that describes the scattering power of an atom as function of the scattering angle


rhombohedral

(crystallography) Having three equal axes and oblique angles.

romboèdric

having three equal axes and oblique angles


diclinous

From di- (“two”) + κλίνη (klínē, “bed”) + -ous.

yksineuvoinen

having stamens and pistils in different flowers


morphotropic

morphotropic (comparative more morphotropic, superlative most morphotropic)

more morphotropic (comparative)
most morphotropic (superlative)

(crystallography) Of or pertaining to morphotropism


microtexture

(crystallography) The set of crystallographic orientations whose components are linked to their individual location in the microstructure.


trigonal

trigonal (comparative more trigonal, superlative most trigonal)

more trigonal (comparative)
most trigonal (superlative)

From Latin trigōnālis (“triangular”), equivalent to trigon + -al.

(crystallography) Of or pertaining to a crystal system with three equal and equally inclined but not perpendicular axes.


epigene

(crystallography) Foreign; unusual; not natural to the substance in which it was found.


gyroid

pentagonal icositetrahedron
pentagonal icositetrahedron#English

pentagonal icosikaitetrahedron
pentagonal icosikaitetrahedron#English

(crystallography) Synonym of pentagonal icositetrahedron or pentagonal icosikaitetrahedron.


cryptomorphic

Coined by Garrett Birkhoff before 1967, for use in the third edition of his book Lattice Theory.

Both have 'cryptomorphic' types which are similar in composition but in which no felspar has crystallized.

1925, The Mineralogical Magazine and Journal of the Mineralogical Society - Volume 20, page 309:

(crystallography) Composed of minerals that are not expressed in their crystalline form.


trilling

Diametrically opposed rays of these stellate groups are of the same optical orientation and the twins are, therefore, trillings ( fig. 29 ).

1966, Geological Survey Professional Paper - Issues 509-510, page 55:

Chrysoberyl is orthorhombic in symmetry. Like many orthorhombic minerals, it readily forms an intergrowth with two other individual crystals to make trillings with six sides or, at least, V-shaped twins.

1974, Mineral Digest, volumes 6-8, page 148:

In the embryonic stage, pseudohexagonal trillings resemble those of the post-embryonic stage (Figure 2D,E), and are 1 to 3 μm in diameter.

2013, Federico Olóriz, Francisco J. Rodríguez-Tovar, Advancing Research on Living and Fossil Cephalopods, page 235:

(crystallography) A compound crystal consisting of three individuals.


syntaxis

en-noun

syntaxis (countable and uncountable, plural syntaxes)

From the Late Latin syntaxis, from the Ancient Greek σύνταξις (súntaxis). Doublet of syntax.


Burgers vector

Named after Dutch physicist Jan Burgers.

(crystallography) A mathematical vector that represents the magnitude and direction of the distortion in a dislocation in a crystal lattice.


pinacoid

Ancient Greek πινάκιον (pinákion, “slab, tablet”) + -oid.

uder

The crystallographic symmetry is initially broken toward dilation symmetry by the splitting of the basal pinacoid or the pseudohexagonal bipyramidal faces of the growing crystal core.

2009 January 16, Juan Manuel Garcia-Ruiz et al., “Morphogenesis of Self-Assembled Nanocrystalline Materials of Barium Carbonate and Silica”, in Science, volume 323, number 5912:

(crystallography) The face of a crystal parallel to two of the axes.


fcc

(crystallography) Initialism of face-centered cubic.


gliding plane

(crystallography) A plane of molecular weakness that allows movement without fracture.


unit cell

The first task for a crystallographer is to establish the shape of the unit cell.

(crystallography) The smallest repeating structure (parallelepiped) of atoms within a crystal, from which the structure of the complete crystal can be inferred.


merohedry

(crystallography) The condition of a crystal whose point group is a subgroup of that of its lattice


photodifference

(crystallography) Used attributively to describe a map of the electron density differencies between parts of a sample that had been irradiated


paracrystal

(crystallography) Any crystalline material that has a highly distorted lattice with unit cells of highly variable shape and size


pseudomerohedry

(crystallography) The condition of being pseudomerohedral


anorthic

(crystallography) Having three unequal axes that intersect obliquely


beamstop

X-ray crystallography
X-ray crystallography

(crystallography) Any of several devices used in X-ray crystallography to avoid damage by X-rays


cryobench

(crystallography) An optical bench designed for cryocrystallography


cryobuffer

(crystallography) A solution, which will not solidify on cooling, in which crystals may be grown at low temperature


microseeding

(crystallography) A technique in which very small crystals are used to seed the formation of much larger ones


microseed

(crystallography) A very small crystal used to seed the formation of larger ones.


detwinned

(crystallography) Describing the components of a twinned crystal that have been separated.


indicatrix

Learned borrowing from Latin indicātrīx. By surface analysis, indicate + -trix.

(mathematics, crystallography) An ellipsoid whose three axes represent the refractive indices of an anisotropic crystal for light following different directions with respect to the crystal axes


pedion

From Ancient Greek πεδίον (pedíon, “plain, field”).

(crystallography) An asymmetric triclinic crystal form that only has one face.


hemimorphic

en-adj

hemimorphic (comparative more hemimorphic, superlative most hemimorphic)

more hemimorphic (comparative)
most hemimorphic (superlative)

(crystallography) Having the two ends (of an axis) modified with unlike planes.


fluoroid

From fluor + -oid. The shape is a common form of fluorite.


orthotomous

orthotomous (comparative more orthotomous, superlative most orthotomous)

more orthotomous (comparative)
most orthotomous (superlative)

From orthotomy + -ous or ortho- + -tomous.

(crystallography) Having two cleavages at right angles with one another.


trimorph

(crystallography) A substance which crystallizes in three distinct forms, or which has three distinct physical states.

(crystallography) Any of the three forms of such a substance.


clinopinacoid

(crystallography) The plane in monoclinic crystals that is parallel to the vertical and the inclined lateral (clinodiagonal) axes.


fourling

(crystallography) A compound or twin crystal consisting of four individuals.


hemiholohedral

(crystallography) Presenting hemihedral forms in which half the sectants have the full number of planes.


hemitrope

(crystallography) A twin crystal having a hemitropal structure.


scalenohedral

(crystallography) Of or pertaining to a scalenohedron.


scalenohedron

en-noun

scalenohedron (plural scalenohedrons or scalenohedra)

scalenohedrons (plural)
scalenohedra (plural)

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Though the hexagonal scalenohedron is derived from the double twelve-faced pyramid, by the development of half its faces, and might be constructed from that figure, it is more readily obtained from the positive or negative rhomboid which may be supposed to be inscribed in the scalenohedron.

1859, James Tennant, Walter Mitchell, Mineralogy and Crystallography: Being a Classification of Crystals According to Their Form, page 408:

By bringing together the rhombohedron and the scalenohedron, as has been done in Fig. 119, it will be noticed that the lateral edges of the two forms have a similar position towards the axes, so that for every scalenohedron there must be a rhombohedron whose lateral edges coincide with the lateral edges of the other form. This rhombohedron is called the inscribed rhombohedron of the scalenohedron.

1866, Josiah Parsons Cooke, Elements of Chemical Physics, page 154:

1907, Benjamin K. Emerson, Joseph H. Perry, The Green Schists and Associated Granites and Porphyries of Rhode Island, US Geological Survey, Bulletin Number 311, page 24,
Other steep scalenohedrons of the principal zone are also often present, sometimes in addition to y, sometimes taking its place.

Calcite crystals show a great variety of habits — acute and obtuse rhombohedra and scalenohedra, prisms, and thin tabular forms.

1940, John W. Evans, George MacDonald Davies, Elementary Crystallography, page 111:

(geometry, mineralogy, crystallography) A polyhedron having twelve sides, each in the form of a scalene triangle, that is topologically equivalent to a hexagonal bipyramid and whose middle section can be said to inscribe a rhombohedron.


hemitropy

(crystallography) Synonym of hemitropism.


orthodiagonal

(crystallography) The diagonal or lateral axis in a monoclinic crystal which is at right angles with the vertical axis.


isogonism

(crystallography) The property of certain substances of crystallizing in similar forms while differing in chemical composition.


orthopinacoid

(crystallography) Either of the two planes in the monoclinic system which are parallel to the vertical and orthodiagonal axes.


hemihedron

hemihedron (plural hemihedrons or hemihedra)

The tetrahedron is a hemihedron.

(crystallography) A solid hemihedrally derived.


eightling

(crystallography) A compound or twin crystal made up of eight individuals, such as are common with rutile.


isomeromorphism

(crystallography, dated) isomorphism between substances that are isomeric


hemihedrism

hemihedrism (countable and uncountable, plural hemihedrisms)


tetrahexahedral

tetrahexahedral morphology

tetrahexahedral particles

(crystallography) Pertaining to a tetrahexahedron.


brachydome

(crystallography) A dome parallel to the shorter lateral axis.


stauroscope

(crystallography) An optical instrument used in determining the position of the planes of light-vibration in sections of crystals.


brachypinacoid

(crystallography) A plane of an orthorhombic crystal which is parallel both to the vertical axis and to the shorter lateral (brachydiagonal) axis.


idiocyclophanous

From idio- + cyclo- (“circle”) + -phanous, from the ring-like appearance of interference structures.


tautozonal

tautozonal planes

(crystallography) Belonging to the same zone.


gyroidal

(crystallography) Having the planes arranged spirally, so that they all incline to the right (or left) of a vertical line; said of certain hemihedral forms.


enhydrous

enhydrous agate

(crystallography) Having water within; containing fluid drops.


idiophanous

en-adj

idiophanous (comparative more idiophanous, superlative most idiophanous)

more idiophanous (comparative)
most idiophanous (superlative)

(crystallography) Exhibiting interference figures without the aid of a polariscope, as certain crystals do.


triakisoctahedron

en-noun

triakisoctahedron (plural triakisoctahedrons or triakisoctahedra)

triakisoctahedrons (plural)
triakisoctahedra (plural)

From Ancient Greek τριάκις (triákis, “thrice”) + English octahedron.

der

(crystallography) A trigonal trisoctahedron.


tetrakishexahedron

en-noun

tetrakishexahedron (plural tetrakishexahedrons or tetrakishexahedra)

tetrakishexahedrons (plural)
tetrakishexahedra (plural)


diclinic

From di- (“two”) + κλίνη (klínē, “bed”) + -ic.

(crystallography) Having two of the intersections between the three axes oblique.


tetartohedral

From Ancient Greek τέταρτος (tétartos) + -hedral.

(crystallography) isometric and tetragonal, but having one fourth of the number of planes required for complete symmetry


tetartohedrism

tetartohedrism (usually uncountable, plural tetartohedrisms)

(archaic, crystallography) tetartohedry (the property of being tetartohedral).


clinodiagonal

(crystallography) That diagonal or lateral axis in a monoclinic crystal which makes an oblique angle with the vertical axis.


pseudomorphism

pseudomorphism (countable and uncountable, plural pseudomorphisms)

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From pseudo- + -morphism or pseudomorph + -ism.

(crystallography) The state of having, or the property of taking, a crystalline form unlike that of the species.

bréagmhorfacht

having or taking a crystalline form unlike that of the species


hypidiomorphic

(crystallography) Partly idiomorphic; having a distinct crystalline form in only some of its constituents.


leucitoid

(crystallography) The trapezohedron or tetragonal trisoctahedron, the form of the mineral leucite.


pseudosymmetric

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trimorphism

trimorphism (countable and uncountable, plural trimorphisms)

Titanium dioxide exhibits trimorphism: its three forms are rutile, octahedrite, and brookite.

(crystallography) The property of crystallizing in three distinct forms.


trisoctahedron

trisoctahedron (plural trisoctahedrons or trisoctahedra)

trisoctahedrons (plural)
trisoctahedra (plural)

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(crystallography) A solid of the isometric system bounded by 24 equal faces, three corresponding to each face of an octahedron.


cubooctahedron

cubooctahedron (plural cubooctahedrons or cubooctahedra)

cubooctahedrons (plural)
cubooctahedra (plural)

(crystallography) A combination of a cube and octahedron, especially one in which the octahedral faces meet at the middle of the cubic edges.


sectant

(crystallography) One of the parts of a crystal into which it is divided by the axial planes.


clinorhombic

From clino- + rhombic: compare French clinorhombique.

(crystallography) Possessing the qualities of a prism, obliquely inclined to a rhombic base; monoclinic.


tessular

en-adj

tessular (comparative more tessular, superlative most tessular)

more tessular (comparative)
most tessular (superlative)

From (assumed) New Latin tessula (diminutive of Latin tessera) + English -ar.


semiform

From Latin sēmifōrmis, equivalent to semi- + form.

This semiform π (312) is again to be observed on crystal No. 13, though it is there represented by only a single face.

1882, L. Fletcher, “Crystallographic Notes”, in London, Edinburgh and Dublin Philosophical Magazine and Journal of Science (Supplement), volume 13, page 479:

As crystals of tourmaline do not rotate the plane of polarisation, it is probable that in the case of the present crystal the hemimorphic development is of a semiform, similar to those which have been observed on dioptase and apatite, and that the form should be designated crystallographically as υκπ {320}.

1886, R. H. Solly, “On the Tetartohedral Development of a Crystal of Tourmaline”, in The Mineralogical Magazine and Journal of the Mineralogical Society, volume 6, page 81:

The eight normals of the tetragonal scalenohedron may carry the eight faces of a semiform in other ways than asymmetrically as regards the systematic planes.

(crystallography) A crystal structure that is more elaborate than the simplest (primitive) form but which does not include all the faces and symmetry elements characteristic of the full crystal system.


plagihedral

plagihedral (comparative more plagihedral, superlative most plagihedral)

more plagihedral (comparative)
most plagihedral (superlative)

Ancient Greek [Term?] oblique + base, seat.

(crystallography) Having an oblique spiral arrangement of planes, as in levogyrate and dextrogyrate crystals.


emarginated

emarginated (comparative more emarginated, superlative most emarginated)

more emarginated (comparative)
most emarginated (superlative)

(crystallography) Having the edges truncated.


lattice constant

en-noun

lattice constant (plural lattice constants)

(crystallography) A constant which describes the geometry of a unit cell in a crystal lattice.


crystal system

The crystal system to which a particular molecule belongs can make a considerable difference to how easy it is to solve.

(crystallography) Any of the seven distinct symmetry classifications of crystals: cubic, tetragonal, hexagonal, orthorhombic, monoclinic, triclinic and trigonal.


clinodome

(crystallography) A dome that is parallel to the inclined axis in a monoclinic crystal


orthodome

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(crystallography) A dome that is parallel to the orthodiagonal in a monoclinic crystal.


micropipe

(crystallography) A defect in a single crystal substrate.


pseudoorthorhombic

(crystallography, obsolete) Having three unequal axes at right angles.


analogous pole

(crystallography) The pole of a crystal that becomes positively electrified when heated.


tetartoid

(crystallography) A crystal of a certain symmetry class with 12 congruent irregular pentagonal faces.


Bravais lattice

Bravais lattice (plural Bravais lattices)

(geometry, crystallography) An infinite array of discrete points generated by a set of discrete translation operations mathbf R=n_1 mathbf a₁+n_2 mathbf a₂+n_3 mathbf a₃, where nᵢ are any integers and aᵢ are known as the primitive vectors which lie in different directions and span the lattice.


syntaxy

(crystallography) An overgrowth in which both the original crystal and the crystal growing on it have the same orientation.


syntaxial

(crystallography) Relating to, or displaying, syntaxy.


distaxy

(crystallography) An overgrowth in which both the original crystal and the crystal growing on it have different orientations.


topotaxy

(crystallography) A reaction in which the parent material determines the orientation of the product.


crystal habit

(crystallography) The characteristic external shape of an individual crystal or crystal group.


crystal class

(crystallography) Any of 32 possible classes of crystals, arising from the 32 possible combinations of symmetry operations.


hemitropal

By surface analysis, hemi- + -trope + -al

surf

(crystallography) Of a crystal: having one part in reverse position with reference to the other part; twinned.


hemitropic

By surface analysis, hemi- + -trope + -ic

(crystallography) Synonym of hemitropal.


didecahedral

(crystallography) Having five planes on each extremity.


optic axis

(crystallography, mineralogy) The direction in which a ray of light passing through a crystal does not suffer double refraction.


rotoreflection

en-noun

rotoreflection (countable and uncountable, plural rotoreflections)

(mathematics, crystallography) rotation (about an axis) and reflection (in a plane perpendicular to that axis)


pseudorhombic

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(geometry, crystallography) describing a structure that is almost rhombohedral


pinacoidal

(crystallography) Relating to the pinacoid.


clinohedral

(crystallography) That has a plane of symmetry but not an axis of symmetry


rotoinversion

rotoinversion (countable and uncountable, plural rotoinversions)

(mathematics, crystallography) The combination of a rotation and an inversion in a point on the axis.


pseudoaxis

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(crystallography) A pseudosymmetric axis.


Frenkel defect

Named after its discoverer, Yakov Frenkel.

(crystallography) A type of point defect in crystalline solids, occurring when an atom or smaller ion (usually cation) leaves its place in the lattice, creating a vacancy, and becomes an interstitial by lodging in a nearby location.


Schottky defect

Schottky defect (plural Schottky defects)

(crystallography) A type of point defect in a crystal lattice in which a set of points in the lattice (anion and cation sites) are vacant in such a way that the overall charge of the solid is neutral.


clinopinacoidal

(crystallography) Relating to the clinopinacoid.


peripolygonal

(crystallography, rare) Having very many sides or angles.


Wigner-Seitz cell

Wigner-Seitz cell (plural Wigner-Seitz cells)

Named after Eugene Wigner and Frederick Seitz.

Voronoi decomposition
Voronoi decomposition

(crystallography) A primitive cell constructed by applying Voronoi decomposition to a crystal lattice, used in the study of crystalline materials.


Laue equations

Named after physicist Max von Laue (1879–1960).

(physics, crystallography) A set of equations relating incoming waves to outgoing waves in the process of elastic scattering.


brachyaxis

(crystallography, obsolete) The shorter lateral axis of some crystals.


relrod

(crystallography) A rod-like shape due to reciprocal lattice points becoming elongated in one direction


hemitropism

(crystallography) The quality of being hemitropal.


monohedron

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Then, in the above example, to RPS lying on the equator there corresponds a prism, to those lying outside the equator, a pyramid, and to the polar point, a monohedron.

2013, Boris K. Vainshtein, Fundamentals of Crystals, page 185:


monoclinicity

The weak coupling between the structural monoclinicity and the vestigial nematicity should not impact the physics of interest.

(crystallography) the state of being monoclinic


-tomous

Possibly analogical to acrotomous, from Ancient Greek ἀκρότομος (akrótomos, “cut off sharp”), ultimately from Ancient Greek τόμος (tómos, “slice, something cut”).

der

(mineralogy, crystallography) Describes the cleavage of minerals