mineral

Chrysocolla on Quartz

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) with Quartz (SiO2)

Hardness: 2-4 (Chrysocolla) and 7 (Quartz); Color: Cyan-blue, turquoise-green mixed with white/grey; Luster: Vitreous to earthy; Crystal Structure: Orthorhombic (Chrysocolla) and Trigonal (Quartz); Specific Gravity: 2.0-2.4.

Hardness: 2-4 (Chrysocolla) and 7 (Quartz)
Color: Cyan-blue, turquoise-green mixed with white/grey
Luster: Vitreous to earthy

Identified June 30, 2026More mineral →

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Physical properties

Formation & geological history

Formed as a secondary mineral in the oxidation zones of copper ore bodies. It occurs when copper-bearing solutions react with silica-rich water. Common in arid regions.

Uses & applications

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

Geological facts

Chrysocolla is often confused with turquoise but is generally softer. It is sometimes found as a 'psuedomorph,' where it replaces the structure of other minerals like Azurite.

Field identification & locations

Look for its characteristic vivid blue-green color near copper mining districts. It can be identified by its tendency to stick to the tongue due to its porous nature and its association with other copper minerals like Malachite.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

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sedimentary

Schist

Metamorphic

Epidote

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

metamorphic

Gypsum (variety Selenite or Alabaster)

Calcium sulfate dihydrate (CaSO4·2H2O)

Mineral

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock