mineral

Chrysocolla on Quartz

Chrysocolla (Cu2−xAlx(H2−xSi2O5)(OH)4·nH2O) often associated with Quartz (SiO2)

Hardness: 2-4 (Chrysocolla) / 7 (Quartz); Color: Cyan, turquoise-blue to bluish-green; Luster: Vitreous to earthy; Crystal Structure: Amorphous or monoclinic; Cleavage: None; Specific Gravity: 2.0-2.4

Hardness: 2-4 (Chrysocolla) / 7 (Quartz)
Color: Cyan, turquoise-blue to bluish-green
Luster: Vitreous to earthy

Identified April 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed as a secondary copper mineral in the oxidation zones of copper ore bodies. It occurs as precipitates from hydrothermal fluids or circulating groundwater containing dissolved copper and silica.

Uses & applications

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

Geological facts

Chrysocolla is often confused with turquoise but is generally softer. When it is infused within quartz, it is known as 'Stellarite' or 'Chrysocolla Chalcedony,' which is much harder and more durable for jewelry.

Field identification & locations

Identify by its distinctive blue-green color and its tendency to stick to the tongue due to its high silica and water content. Often found in Arizona (USA), Chile, Congo, and Peru.

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