Rock Identifier
Chrysocolla in Matrix (Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4' nH2O on Quartz/Feldspar matrix) — mineral
mineral

Chrysocolla in Matrix

Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4' nH2O on Quartz/Feldspar matrix

Hardness: 2-4 (Chrysocolla) to 6-7 (Matrix); Color: Cyan/sea-green crusts on reddish-brown matrix; Luster: Vitreous to earthy; Structure: Amorphous/Monoclinic; Specific Gravity: 2.0-2.4

Hardness
2-4 (Chrysocolla) to 6-7 (Matrix)
Color
Cyan/sea-green crusts on reddish-brown matrix
Luster
Vitreous to earthy
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Physical properties

Hardness: 2-4 (Chrysocolla) to 6-7 (Matrix); Color: Cyan/sea-green crusts on reddish-brown matrix; Luster: Vitreous to earthy; Structure: Amorphous/Monoclinic; Specific Gravity: 2.0-2.4

Formation & geological history

Formed in the oxidation zones of copper ore bodies where copper-bearing solutions react with silica in groundwater. Often found in arid regions within weathered igneous rock.

Uses & applications

Primarily used as a minor ore of copper, for lapidary work (cabochons), and as vibrant collector specimens.

Geological facts

Chrysocolla is often confused with turquoise but contains more water and is generally softer. It has been used since ancient times for soldering gold, which is where its name (Greek for 'gold glue') originates.

Field identification & locations

Identify by its distinctive blue-green color and association with other copper minerals like malachite. Found in copper mines in Arizona (USA), Chile, and the DRC. Collectors look for high color contrast against the host rock.

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