"Tyndall stone" meaning in English

{
  "etymology_text": "After the town of Tyndall, Manitoba, where the stone is quarried, in turn named after Irish physicist John Tyndall (1820–93). Tyndall, Tindall (“inhabitant of the Tyne river valley”) < Tyne.",
  "forms": [
    {
      "form": "Tyndall stones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
        "2": "s"
      },
      "expansion": "Tyndall stone (usually uncountable, plural Tyndall stones)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Canadian English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1994, Carol Shields, The Stone Diaries, Toronto: Penguin., →ISBN, page 64:",
          "text": "More and more my father chooses to decorate the stone surfaces with elaborate cipher, even though Tyndall stone, with its mottled coloring, is thought to be resistant to fine carving.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A dolomitic limestone quarried in the vicinity of Tyndall, Manitoba, Canada, famous for its pervasive mottling and numerous fossils."
      ],
      "id": "en-Tyndall_stone-en-noun-3~3e~8jv",
      "links": [
        [
          "dolomitic",
          "dolomitic"
        ],
        [
          "limestone",
          "limestone"
        ],
        [
          "mottling",
          "mottling"
        ],
        [
          "fossil",
          "fossil"
        ]
      ],
      "raw_glosses": [
        "(Canada) A dolomitic limestone quarried in the vicinity of Tyndall, Manitoba, Canada, famous for its pervasive mottling and numerous fossils."
      ],
      "synonyms": [
        {
          "word": "Tyndall limestone"
        }
      ],
      "tags": [
        "Canada",
        "uncountable",
        "usually"
      ],
      "wikipedia": [
        "Tyndall stone"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈtɪndəl stoʊn/"
    }
  ],
  "word": "Tyndall stone"
}

{
  "etymology_text": "After the town of Tyndall, Manitoba, where the stone is quarried, in turn named after Irish physicist John Tyndall (1820–93). Tyndall, Tindall (“inhabitant of the Tyne river valley”) < Tyne.",
  "forms": [
    {
      "form": "Tyndall stones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
        "2": "s"
      },
      "expansion": "Tyndall stone (usually uncountable, plural Tyndall stones)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Canadian English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "1994, Carol Shields, The Stone Diaries, Toronto: Penguin., →ISBN, page 64:",
          "text": "More and more my father chooses to decorate the stone surfaces with elaborate cipher, even though Tyndall stone, with its mottled coloring, is thought to be resistant to fine carving.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A dolomitic limestone quarried in the vicinity of Tyndall, Manitoba, Canada, famous for its pervasive mottling and numerous fossils."
      ],
      "links": [
        [
          "dolomitic",
          "dolomitic"
        ],
        [
          "limestone",
          "limestone"
        ],
        [
          "mottling",
          "mottling"
        ],
        [
          "fossil",
          "fossil"
        ]
      ],
      "raw_glosses": [
        "(Canada) A dolomitic limestone quarried in the vicinity of Tyndall, Manitoba, Canada, famous for its pervasive mottling and numerous fossils."
      ],
      "tags": [
        "Canada",
        "uncountable",
        "usually"
      ],
      "wikipedia": [
        "Tyndall stone"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈtɪndəl stoʊn/"
    }
  ],
  "synonyms": [
    {
      "word": "Tyndall limestone"
    }
  ],
  "word": "Tyndall stone"
}