mineral
Green copper mineral specimen, likely chrysocolla or turquoise
Chrysocolla: hydrated copper aluminosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; possibly turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O
AI-generated identification · may be incorrectBlue-green, opaque, earthy to waxy luster, irregular fracture, and generally hardness 2–4 for chrysocolla or 5–6 for turquoise; the rough, porous appearance favors chrysocolla or a chrysocolla-bearing rock.
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Physical properties
Blue-green, opaque, earthy to waxy luster, irregular fracture, and generally hardness 2–4 for chrysocolla or 5–6 for turquoise; the rough, porous appearance favors chrysocolla or a chrysocolla-bearing rock.
Formation & geological history
Forms in oxidized zones of copper deposits through groundwater alteration, commonly during weathering over geologically long periods; precise age cannot be determined from the photograph.
Uses & applications
Used as a copper-associated mineral, ornamental stone, pigment, and lapidary material; harder turquoise is used in jewelry, while soft chrysocolla is often stabilized or polished.
Geological facts
Chrysocolla commonly occurs with malachite, azurite, quartz, and limonite, producing mottled green-blue specimens.
Field identification & locations
Look for vivid blue-green color, botryoidal or earthy texture, and association with copper minerals; turquoise is harder and more compact, while chrysocolla may scratch easily with a steel knife. Common localities include Arizona, Nevada, Chile, Peru, Mexico, and the Democratic Republic of Congo.
