mineral

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)

Hardness: 2.5-3.5 (often higher when silicated); Color: cyan, green, or blue; Luster: vitreous to dull; Crystal structure: orthorhombic (microcrystalline); Specific gravity: 2.0-2.4

Hardness: 2
Color: cyan, green, or blue
Luster: vitreous to dull

Identified April 7, 2026More mineral →

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Physical properties

Hardness: 2.5-3.5 (often higher when silicated); Color: cyan, green, or blue; Luster: vitreous to dull; Crystal structure: orthorhombic (microcrystalline); Specific gravity: 2.0-2.4

Formation & geological history

Formed as a secondary mineral in the oxidation zones of copper ore bodies. It occurs from the weathering of primary copper minerals like chalcopyrite and bornite, typically found in arid climates.

Uses & applications

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

Geological facts

The name comes from the Greek 'chrysos' (gold) and 'kolla' (glue), referring to its use as a solder for gold in ancient times. It is often found intermixed with quartz (gem silica), malachite, or azurite.

Field identification & locations

Identify in the field by its distinct cyan color and tendency to stick to the tongue due to its porous nature. Commonly found in Arizona (USA), Chile, Peru, and the Democratic Republic of Congo.

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