mineral
Blue-green copper mineral specimen, likely chrysocolla-bearing rock
Chrysocolla, hydrated copper phyllosilicate: approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; possibly mixed with malachite or chrysocolla matrix
AI-generated identification · may be incorrectIrregular rough fragment with blue-green coloration and earthy to subvitreous luster. Chrysocolla has Mohs hardness 2.5–3.5, no prominent cleavage, and low-to-moderate specific gravity (about 2.0–2.4); exact properties vary with matrix minerals.
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Physical properties
Irregular rough fragment with blue-green coloration and earthy to subvitreous luster. Chrysocolla has Mohs hardness 2.5–3.5, no prominent cleavage, and low-to-moderate specific gravity (about 2.0–2.4); exact properties vary with matrix minerals.
Formation & geological history
Forms as a secondary copper mineral in oxidized zones of copper deposits, precipitating from copper-rich groundwater. It is generally geologically young relative to its host rocks, commonly associated with malachite, azurite, quartz, and limonite.
Uses & applications
Used as a lapidary material, ornamental stone, pigment historically, and collector specimen; softer pieces are often stabilized before polishing. It has limited construction or industrial use.
Geological facts
Blue-green color reflects hydrated copper; darker green or blue patches may indicate malachite or azurite admixture. Color alone cannot distinguish it confidently from turquoise, dyed stone, or other copper minerals.
Field identification & locations
Common in Arizona, New Mexico, Chile, Peru, the Democratic Republic of Congo, Mexico, and Australia. A streak, hardness test, magnification, and copper-mineral associations help identify it; avoid acid or destructive tests on valuable specimens.
