mineral

Chrysocolla on Matrix

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

Hardness: 2.5-3.5 (often harder if mixed with quartz); Color: Cyan, turquoise blue, bluish-green; Luster: Vitreous to earthy; Crystal Structure: Amorphous/Orthorhombic; Specific Gravity: 2.0-2.4

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

Identified June 26, 2026More mineral →

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Physical properties

Hardness: 2.5-3.5 (often harder if mixed with quartz); Color: Cyan, turquoise blue, bluish-green; Luster: Vitreous to earthy; Crystal Structure: Amorphous/Orthorhombic; Specific Gravity: 2.0-2.4

Formation & geological history

Formed in the oxidation zones of copper ore bodies. It is a secondary mineral resulting from the alteration of primary copper minerals like chalcopyrite. The reported location (Matapedia Valley area, Quebec) is known for Appalachian copper mineralization.

Uses & applications

A minor ore of copper, used in jewelry as a gemstone, and highly valued by mineral collectors for its vibrant color.

Geological facts

Chrysocolla is often confused with turquoise but can be distinguished by its lower hardness and it tends to be more likely to stick to the tongue due to its porous nature. The name comes from the Greek 'chrysos' (gold) and 'kolla' (glue), referencing its use as a soldering agent in ancient times.

Field identification & locations

Identify in the field by its distinct blue-green color on host rock (matrix) and its association with other copper minerals like malachite. In Quebec, these secondary copper minerals are often found in metamorphic or sedimentary rocks associated with tectonic suture zones.

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