"Tyndall stone" meaning in English

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  "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.",
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      "form": "Tyndall stones",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "examples": [
        {
          "ref": "1994, Carol Shields, The Stone Diaries, Toronto: Penguin., 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.",
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      ],
      "glosses": [
        "A dolomitic limestone quarried in the vicinity of Tyndall, Manitoba, Canada, famous for its pervasive mottling and numerous fossils."
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      "id": "en-Tyndall_stone-en-noun-3~3e~8jv",
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          "dolomitic",
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          "limestone",
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          "mottling",
          "mottling"
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        "(Canada) A dolomitic limestone quarried in the vicinity of Tyndall, Manitoba, Canada, famous for its pervasive mottling and numerous fossils."
      ],
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          "word": "Tyndall limestone"
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        "Tyndall stone"
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  "sounds": [
    {
      "ipa": "/ˈtɪndəl stoʊn/"
    }
  ],
  "word": "Tyndall stone"
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  "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": [
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  "lang_code": "en",
  "pos": "noun",
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      "ipa": "/ˈtɪndəl stoʊn/"
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  "synonyms": [
    {
      "word": "Tyndall limestone"
    }
  ],
  "word": "Tyndall stone"
}