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Dioptase Reference Libraries

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Dioptase
2005-05-26 11:03:19

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. It specific gravity is 3.28 - 3.35, and it has two perfect and one very good cleavage directions. Additionally, dioptase is...

Word of the Day
malpais
  • The ragged surface of a lava-flow.
'Malpais' translates from Spanish as 'bad land.'