Cyclosilicate (ring silicate)
Specific gravity: 3.3
Colour: Emerald green
Solubility: Moderately soluble in hydrochloric acid
Dioptase occurs as a secondary mineral in the oxidised zone
of high temperature hydrothermal copper deposits (Webmin, HOM).
Associated minerals include chrysocolla,
hemimorphite, fluorite and
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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