mineral

Chrysocolla

Chrysocolla, (Cu, Al)2H2Si2O5(OH)4·nH2O

Hardness: 2.5-3.5 (can be higher if silicified); Color: Cyan, blue-green, or green; Luster: Vitreous to dull; Crystal structure: Amorphous to Orthorhombic; Cleavage: None; Specific Gravity: 2.0-2.4

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

Identified April 7, 2026More mineral →

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Physical properties

Hardness: 2.5-3.5 (can be higher if silicified); Color: Cyan, blue-green, or green; Luster: Vitreous to dull; Crystal structure: Amorphous to Orthorhombic; Cleavage: None; Specific Gravity: 2.0-2.4

Formation & geological history

Formed as a secondary mineral in the oxidation zones of copper ore bodies. It occurs when copper-bearing solutions react with silica-rich water at low temperatures.

Uses & applications

A minor ore of copper, but primarily used for lapidary purposes, jewelry (often stabilized), and as a colorful gemstone for collectors.

Geological facts

Historically, the name 'Chrysocolla' was derived from the Greek words 'chrysos' (gold) and 'kolla' (glue), as it was used as a flux for soldering gold in antiquity.

Field identification & locations

Look for its characteristic vivid blue-green color near copper mines. It is often found associated with other copper minerals like azurite, malachite, and cuprite. Field testers often check it by touching it to the tongue; because it is porous, it will often stick slightly.