mineral
Chrysocolla-bearing rock (likely chrysocolla in quartz/limonite matrix)
Chrysocolla, hydrated copper aluminosilicate: (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O
AI-generated identification · may be incorrectBlue-green to turquoise coloration occurs as earthy coatings and patches with brown iron-oxide matrix; typically dull to waxy, microcrystalline, and non-cleavable. Mohs hardness is about 2.5–3.5 for chrysocolla, with variable hardness where quartz is present; specific gravity about 1.9–2.4.
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Physical properties
Blue-green to turquoise coloration occurs as earthy coatings and patches with brown iron-oxide matrix; typically dull to waxy, microcrystalline, and non-cleavable. Mohs hardness is about 2.5–3.5 for chrysocolla, with variable hardness where quartz is present; specific gravity about 1.9–2.4.
Formation & geological history
Forms in the oxidized zones of copper deposits when copper-rich fluids alter feldspar, mica, and silica. It is commonly Cenozoic to older, depending on the host deposit, and the specimen appears rough and unpolished.
Uses & applications
Used as a lapidary stone, cabochon material, pigment, and mineral specimen; softer pieces are often stabilized with resin. Common material generally has modest commercial value.
Geological facts
Chrysocolla is frequently associated with malachite, azurite, turquoise, quartz, and limonite, producing attractive blue-green mixtures often sold as “chrysocolla matrix.”
Field identification & locations
Common localities include Arizona, Nevada, Chile, Peru, Mexico, the Democratic Republic of Congo, and Australia. Identify it by its vivid blue-green copper staining, softness, earthy texture, and association with oxidized copper minerals; avoid acids and prolonged water exposure.
