What is the meaning of Dioptase?

(n.) A hydrous silicate of copper, occurring in emerald-green crystals.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). Dioptase. Retrieved September 21, 2026, from http://smartdefine.org/dioptase/definitions/1997844
ChicagoWebster's. 2011. "Dioptase" http://smartdefine.org/dioptase/definitions/1997844 (accessed September 21, 2026).
HarvardWebster's 2011, Dioptase, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/dioptase/definitions/1997844>.
MLAWebster's. "Dioptase" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/dioptase/definitions/1997844>