mineral

Chrysocolla

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

Hardness: 2.5-3.5 Mohs (often variable depending on silica content); Color: Cyan, turquoise-blue, or green; Luster: Vitreous to earthy; Crystal structure: Orthorhombic (usually massive or botryoidal); Specific gravity: 2.0-2.4

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

Identified July 15, 2026More mineral →

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Physical properties

Formation & geological history

Formed as a secondary mineral in the oxidation zones of copper ore bodies where copper minerals are altered by water containing dissolved silica. Found in various geological ages alongside copper deposits.

Uses & applications

Major use in jewelry as a gemstone, lapidary carvings, and as a minor ore of copper. It is also highly prized by mineral collectors.

Geological facts

Chrysocolla is often found mixed with quartz (forming Gem Silica), malachite, or azurite. Historically, it was used by many ancient cultures, including the Greeks, who named it 'gold glue' (chrysos - gold, kolla - glue) as it was used to solder gold.

Field identification & locations

Identify by its vivid blue-green color, low hardness, and tendency to stick to the tongue slightly due to its porous nature. Commonly found in copper-rich regions like Arizona (USA), Chile, DR Congo, and Israel.

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Potassium Feldspar (Orthoclase)

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