Dioptase

cyclosilicate

Formula: CuSiO3.H2O cyclosilicate (ring silicate)
Specific gravity: 3.3
Hardness: 5
Streak: Green
Colour: Emerald green
Solubility: Moderately soluble in hydrochloric acid
Environments:

Hydrothermal environments

Dioptase occurs in the oxidation zone of high temperature hydrothermal deposits.

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