mineral

Chrysocolla on Matrix

Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O

Hardness: 2.5-3.5 (often harder if mixed with quartz); Color: Cyan-blue, turquoise, green; Luster: Vitreous to dull; Crystal structure: Orthorhombic (usually cryptocrystalline); Specific Gravity: 2.0-2.4.

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

Identified April 7, 2026More mineral →

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Physical properties

Formation & geological history

Secondary mineral formed in the oxidation zones of copper ore bodies. Frequently occurs as crusts, vein fillings, or botryoidal masses alongside other copper minerals like malachite and azurite.

Uses & applications

Primarily used as a minor ore of copper, as a gemstone for jewelry (cabochons), and as a popular specimen for mineral collectors.

Geological facts

Chrysocolla is often confused with turquoise due to its color, but it is softer. The name comes from the Greek 'chrysos' (gold) and 'kolla' (glue), referring to its ancient use as a soldering material for gold.

Field identification & locations

Identify in the field by its distinct blue-green color and its tendency to stick to the tongue if licked (due to its porous, hydrated nature). Commonly found in arid regions like Arizona (USA), Chile, and the DRC.

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