dioptase
/dʌɪˈɒpteɪz
/noun [mass noun]
A rare mineral occurring as emerald green or blue-green crystals. It consists of a hydrated silicate of copper.For digital photography, SoLux bulbs are perfect, yielding accurate rendition of difficult-to-photograph minerals such as dioptase and azurite....
- Many of the best Tsumeb cerussite, dioptase, azurite, smithsonite, and other specimens passed through his hands en route to some faraway collection.
- Tantara dioptase occurs well crystallized with quartz, plancheite, shattuckite, fornacite, and chrysocolla.
Origin
Early 19th century: from French, formed irregularly from Greek dioptos 'transparent'.
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