mineral

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O)

Hardness: 2.5-3.5 on Mohs scale; Color: Cyan, blue-green, or green; Luster: Vitreous to dull/earthy; Crystal Structure: Orthorhombic (often amorphous or botryoidal); Specific Gravity: 2.0-2.4

Hardness: 2
Color: Cyan, blue-green, or green
Luster: Vitreous to dull/earthy

Identified March 22, 2026More mineral →

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Physical properties

Hardness: 2.5-3.5 on Mohs scale; Color: Cyan, blue-green, or green; Luster: Vitreous to dull/earthy; Crystal Structure: Orthorhombic (often amorphous or botryoidal); Specific Gravity: 2.0-2.4

Formation & geological history

Formed in the oxidation zones of copper ore bodies where copper-rich solutions react with silica and oxygen. It is a secondary mineral typically found alongside quartz, malachite, and azurite.

Uses & applications

Primarily used as a minor copper ore and as a gemstone for jewelry (cabochons and beads). Also highly valued by mineral collectors for its vibrant color.

Geological facts

The name comes from the Greek words 'chrysos' (gold) and 'kolla' (glue), referencing its ancient use as a component for soldering gold. It is often found intergrown with quartz, creating a harder material known as 'Stellarite' or 'Chrysocolla-in-quartz'.

Field identification & locations

Identify in the field by its distinctive blue-green color and its tendency to stick to the tongue due to its high water content and porosity. Commonly found in the Southwestern USA (Arizona), Chile, Peru, and the Democratic Republic of the Congo.

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