mineral

Chrysocolla in Matrix

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)

Hardness: 2.5-3.5 (often harder if high in silica); Color: Cyan, turquoise blue, bluish-green; Luster: Vitreous to earthy; Crystal Structure: Monoclinic (usually amorphous or cryptocrystalline); Cleavage: None; Specific Gravity: 2.0-2.4

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

Identified July 14, 2026More mineral →

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Physical properties

Formation & geological history

Formed in the oxidation zones of copper ore bodies where copper-bearing solutions react with silica and oxygen. It is a secondary mineral usually found alongside malachite, azurite, and cuprite.

Uses & applications

Primarily used as a minor ore of copper, as a semi-precious gemstone for jewelry (cabochons and beads), and as a popular specimen for mineral collectors.

Geological facts

Chrysocolla is often confused with turquoise, but it is softer and lighter. The name originated from the Greek words 'chrysos' (gold) and 'kolla' (glue), referencing its use as a soldering agent for gold in ancient times.

Field identification & locations

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

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Sandstone with Mineral Veining or Crust

Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)

sedimentary

Schist

Metamorphic

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

mineral

Gypsum (variety Selenite or Alabaster)

Calcium sulfate dihydrate (CaSO4·2H2O)

Mineral

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic