Chrysocolla

phyllosilicate

copper

Formula: (Cu2-xAlx)H2-xSi2O5 (OH)4.nH2O phyllosilicate (sheet silicate)
Specific gravity: 2.0 to 2.2
Hardness: 2 to 4
Streak: Greenish white
Colour: Light blue, blue, greenish blue
Solubility: Slightly soluble in hydrochloric, sulphuric and nitric acid. Insoluble in water.
Environments:

Hydrothermal environments

Chrysocolla is a secondary mineral that forms in the oxidation zone of all types of hydrothermal deposits, often encrusting or replacing earlier secondary minerals. It is associated with malachite, azurite, cuprite and native copper.

At the 79 mine, Pinal county, Arizona, USA, pseudomorphs of chrysocolla after hemimorphite have been found (R&M 94.2.169).

At the Bagdad mine, Yavapai county, Arizona, USA, massive chrysocolla is common, and rare large pseudomorphs of chrysocolla after azurite have been found in the oxide zone, also equally rare chrysocolla after malachite after azurite (R&M 94.2.164).

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