Dioptase

minerals

chrysocolla

malachite

wulfenite

Images
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 as a secondary mineral in the oxidised zone of high temperature hydrothermal copper deposits (Webmin, HOM). Associated minerals include chrysocolla, malachite, mimetite, wulfenite, cerussite, hemimorphite, fluorite and quartz (HOM, Mindat).

Localities

At the type locality, the Altyn-Tyube dioptase deposit, Bukhar-Zhyrau, Karaganda Region, Kazakhstan, dioptase occurs as a secondary mineral in the oxidised zones of copper deposits (Mindat).

At the Magma mine, Pioneer District, Pinal county, Arizona, USA, dioptase has been found associated with minor amounts of chrysocolla, azurite, malachite and olivenite, and occasionally crystals of wulfenite and cerussite to 2 mm (R&M 95.1.84).

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