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dioptase

[ dahy-op-teys ]

noun

  1. a mineral, hydrous copper silicate, CuSiO 3 ⋅H 2 O, occurring in emerald-green crystals.


dioptase

/ -teɪz; daɪˈɒpteɪs /

noun

  1. a green glassy mineral consisting of hydrated copper silicate in hexagonal crystalline form. Formula: Cu 6 Si 6 O 18 .6H 2 O


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Word History and Origins

Origin of dioptase1

1795–1805; < French, equivalent to di- di- 3 + Greek optasía view
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Word History and Origins

Origin of dioptase1

C19: from French, from Greek dia- through + optos visible

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