mineral

Chrysocolla

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O

Hardness: 2.5-3.5 (often harder if mixed with quartz); Color: bright cyan, blue-green; Luster: vitreous to earthy; Crystal Structure: Amorphous/monoclinic (acicular crystals rare); Specific Gravity: 2.0-2.4.

Hardness: 2
Color: bright cyan, blue-green
Luster: vitreous to earthy

Identified July 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed in the oxidation zones of copper-rich ore bodies through the precipitation of silica-rich fluids. It is a secondary mineral usually found as botryoidal or crust-like coatings.

Uses & applications

Used primarily as a gemstone for jewelry (cabochons and beads) and as a minor ore of copper. It is highly valued by mineral collectors for its vibrant color.

Geological facts

Chrysocolla's name comes from the Greek words 'chrysos' (gold) and 'kolla' (glue), referring to its ancient use as a flux for soldering gold. It is often confused with turquoise but is generally softer and more blue.

Field identification & locations

Identify by its vivid cyan-blue color, low hardness, and tendency to stick to the tongue due to its porous nature. It is commonly found in arid regions like Arizona (USA), Chile, Congo, and Israel.