DIOPTASE


Meaning of DIOPTASE in English

dīˈäpˌtās, -āz noun

( -s )

Etymology: French, probably from Late Greek dioptos transparent (from Greek dia- + optos visible, from opsesthai to be going to see) + French -ase (as in euclase ) — more at optic

: a mineral CuSiO 2 (OH) 2 consisting of hydrous copper silicate and occurring in emerald-green crystals and massive (hardness 5, specific gravity 3.47)

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.