mineral
Chrysocolla-bearing copper ore
Chrysocolla (hydrated copper phyllosilicate; commonly approximated Cu₂H₂Si₂O₅(OH)₄·nH₂O), with possible malachite/limonite matrix
AI-generated identification · may be incorrectBlue-green to turquoise, earthy-to-waxy luster, usually massive rather than crystalline; Mohs hardness about 2.5–4, uneven fracture, and moderate-to-low specific gravity (~2.0–2.4). The brown, cream, and dark areas likely represent iron oxides, silica, and copper-oxide minerals around a small vug.
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Physical properties
Blue-green to turquoise, earthy-to-waxy luster, usually massive rather than crystalline; Mohs hardness about 2.5–4, uneven fracture, and moderate-to-low specific gravity (~2.0–2.4). The brown, cream, and dark areas likely represent iron oxides, silica, and copper-oxide minerals around a small vug.
Formation & geological history
Forms in the oxidized zone above copper sulfide deposits when groundwater alters copper minerals; typically Cenozoic to older, deposit-dependent. Commonly occurs with malachite, azurite, cuprite, quartz, and limonite.
Uses & applications
Used as an ornamental stone, cabochon material, pigment, and copper ore when sufficiently concentrated; porous specimens are mainly collected for display.
Geological facts
Its color comes from hydrated copper-bearing compounds, but chrysocolla is often a mixture or intergrowth rather than a pure mineral mass. It can resemble turquoise or dyed stone but is generally softer and more porous.
Field identification & locations
Likely chrysocolla-rich copper ore based on the blue-green, botryoidal-looking surface and iron-stained cavities; confirm with a streak, hardness, and ideally copper-mineral testing. Typical localities include Arizona, Nevada, Chile, Peru, the Democratic Republic of Congo, and Australia.
