mineral

Chrysocolla

Chrysocolla - (Cu,Al)2H2Si2O5(OH)4·nH2O

Hardness: 2.5–3.5 (often harder when silicified); Color: Cyan, blue-green, or green; Luster: Vitreous to earthy; Crystal Structure: Amorphous (orthorhombic-related); Cleavage: None; Specific Gravity: 2.0–2.4.

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

Identified March 4, 2026More mineral →

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Physical properties

Formation & geological history

Formed in the oxidation zones of copper ore bodies as a secondary mineral. It precipitates from aqueous solutions containing silica and dissolved copper. Found in arid regions globally.

Uses & applications

Primarily used as an ornamental stone and in jewelry (cabochons and beads). Historically used as a minor copper ore and as a flux for soldering gold and silver.

Geological facts

The name comes from the Greek 'chrysos' (gold) and 'kolla' (glue), referring to its ancient use as a soldering agent. It is often found intergrown with other minerals like quartz or malachite, making it harder and more durable for jewelry.

Field identification & locations

Identify in the field by its distinct cyan color and tendency to stick to the tongue if licked (due to its high silica/porous nature). Common in copper mines in Arizona (USA), Chile, and the DRC.