dioptase

dioptase

[dahy-op-teys]
noun
a mineral, hydrous copper silicate, CuSiO 3 ⋅H 2 O, occurring in emerald-green crystals.

Origin:
1795–1805; < French, equivalent to di- di-3 + Greek optasía view

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World English Dictionary
dioptase (daɪˈɒpteɪs, -teɪz)
 
n
a green glassy mineral consisting of hydrated copper silicate in hexagonal crystalline form. Formula: Cu6Si6O18.6H2O
 
[C19: from French, from Greek dia- through + optos visible]

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