1) Beautiful stone 2) Cut mineral 3) Decorative stone 4) Gemstone 5) Gemstone mineral 6) Jewel mineral 7) Jewel 8) Mineral gemstone 9) Mineral jewel 10) Polished jewel 11) Polished mineral 12) Precious gem 13) Prized mineral 14) Prized stone 15) Precious jewel 16) Precious stone 17) Precious gemstone
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https://www.crosswordclues.com/clue/dioptase
Dioptase is an intense emerald-green to bluish-green copper cyclosilicate mineral. It is transparent to translucent. Its luster is vitreous to sub-adamantine. Its formula is CuSiO3·H2O (also reported as CuSiO2(OH)2). It has a hardness of 5, the same as tooth enamel. Its specific gravity is 3.28–3.35, and it has two perfect and one very good cle...
Found on
http://en.wikipedia.org/wiki/Dioptase
• (n.) A hydrous silicate of copper, occurring in emerald-green crystals.
Found on
http://thinkexist.com/dictionary/meaning/dioptase/
Di·op'tase noun [ Greek ... =
dia` through + ... to see: confer French
dioptase .]
(Min.) A hydrous silicate of copper, occurring in emerald-green crystals.
Found on
http://www.encyclo.co.uk/webster/D/69
Dioptase is a bright-green silicate of copper and is found in the oxidation zone of copper deposits and in cavities of massive copper minerals. It resembles emerald in appearance, but has the formulae CuSiO2(OH)2 and a relative hardness of 5.
Found on
http://www.probertencyclopaedia.com/browse/HD.HTM
(Iron Aluminum Silicate) Dioptase is a very beautiful mineral and it is one of the few minerals that can challenge the peerlessness of emerald's deep green. Unfortunately it is rather soft (for a gemstone) and has good cleavage and therefore is not usually cut as a gemstone. The mineral specimens that dioptase produces, however,...
Found on
https://www.encyclo.co.uk/local/23719
a mineral, hydrous copper silicate, CuSiO&multiplydot;HO, occurring in emerald-green crystals.
Found on
https://www.infoplease.com/dictionary/dioptase
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