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dioptase

[dahy-op-teys] /daɪˈɒp teɪs/
noun
1.
a mineral, hydrous copper silicate, CuSiO 3 ⋅H 2 O, occurring in emerald-green crystals.
Origin
1795-1805
1795-1805; < French, equivalent to di- di-3 + Greek optasía view
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for dioptase

dioptase

/daɪˈɒpteɪs; -teɪz/
noun
1.
a green glassy mineral consisting of hydrated copper silicate in hexagonal crystalline form. Formula: Cu6Si6O18.6H2O
Word Origin
C19: from French, from Greek dia- through + optos visible
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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