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Webster 1828 Edition

Noun.

A mineral of a pale leek green color, massive or disseminated, and in narrow radiated concretions.

omphacite ‎(usually uncountable, plural omphacites)

(mineralogy) Any of a range of green, monoclinic pyroxene minerals found in eclogites and similar rocks; they are solid solutions of jadeite and diopside.

mineral