mineral
Blue-green chrysocolla rough specimen
Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite
AI-generated identification · may be incorrectTypically blue, green, or turquoise with a dull to vitreous/waxy luster; amorphous or cryptocrystalline, with indistinct cleavage and hardness about 2.5–3.5 Mohs. The specimen appears botryoidal and heavily copper-mineralized, possibly with darker matrix or malachite inclusions.
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Physical properties
Typically blue, green, or turquoise with a dull to vitreous/waxy luster; amorphous or cryptocrystalline, with indistinct cleavage and hardness about 2.5–3.5 Mohs. The specimen appears botryoidal and heavily copper-mineralized, possibly with darker matrix or malachite inclusions.
Formation & geological history
Forms as a secondary copper-mineral in oxidized zones above copper sulfide deposits, precipitating from copper-rich groundwater. It commonly formed during weathering over geologically ancient ore bodies, though its exact age varies by deposit.
Uses & applications
Used as a lapidary stone, ornamental material, pigment, and collector specimen; harder chrysocolla-quartz composites may be made into cabochons and jewelry.
Geological facts
Chrysocolla is often confused with turquoise because of its vivid blue-green color, but it is generally softer and less compact. Copper content produces the characteristic coloration.
Field identification & locations
Common in copper districts of Arizona, Nevada, Chile, Peru, Mexico, Australia, and the Democratic Republic of the Congo. Confirm with a soft hardness test, pale blue-green streak, and association with malachite or azurite; avoid acid and water testing on polished pieces.
