dioptase

[dahy-op-teys]

Origin of dioptase

1795–1805; < French, equivalent to di- di-3 + Greek optasía view
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British Dictionary definitions for dioptase

dioptase

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

Word Origin for dioptase

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