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idocrase

[ahy-duh-kreys, id-uh-] /ˈaɪ dəˌkreɪs, ˈɪd ə-/
noun, Mineralogy
Origin
1795-1805
1795-1805; < French < Greek eîdo(s) form + krâsis mixture
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for idocrase

idocrase

/ˈaɪdəˌkreɪs; ˈɪd-/
noun
1.
another name for vesuvianite
Word Origin
C19: from French, from Greek eidos form + krasis a mingling
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for idocrase

common silicate mineral that occurs in crystalline limestones near their contacts with igneous rocks, and in beds of marble and calcsilicate granulite that are associated with gneiss and mica schist. Fine glassy crystals coloured yellow, green, or brown have been found in the Ala Valley in the Piedmont, and on Mte. Somma, Italy; the Vilyuy River, Siberia; Christiansand, Nor.; Litchfield, Quebec; and Auburn, Maine, Amity, N.Y., and Franklin, N.J. For chemical formula and detailed physical properties, see silicate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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