mineral

Chrysocolla on Matrix

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

Hardness: 2.5-3.5 on Mohs scale; Color: Cyan, turquoise blue, or green; Luster: Vitreous to dull; Crystal structure: Orthorhombic (usually massive or botryoidal); Cleavage: None; Specific gravity: 2.0-2.4

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

Identified June 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed in the oxidation zones of copper ore bodies where copper-bearing solutions react with silica-rich groundwater. Found in arid regions worldwide.

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 but is much softer. It is sometimes found intergrown with quartz, which makes it hard enough for jewelry use (known as Stellarite or Gem Silica).

Field identification & locations

Identify by its vivid blue-green color and its tendency to stick to the tongue due to its porous nature. Commonly found in Arizona, Chile, and the Democratic Republic of Congo.

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Mineral/Rock

Banded Gneiss (River Rock/Pebble)

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Metamorphic Rock

Green Apatite on Albite

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mineral