dioptase

[ dahy-op-teys ]
/ daɪˈɒp teɪs /

noun

a mineral, hydrous copper silicate, CuSiO3⋅H2O, occurring in emerald-green crystals.

Origin of dioptase

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

Words nearby dioptase

diophantine analysis, diophantine equation, diophantus, diopside, diopsimeter, dioptase, diopter, dioptometer, dioptre, dioptric, dioptric aberration

British Dictionary definitions for dioptase

dioptase
/ (daɪˈɒpteɪs, -teɪz) /

noun

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