mineral
Chrysocolla-bearing quartz (likely chrysocolla in quartz)
Chrysocolla, hydrated copper aluminosilicate: approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O, intergrown with quartz (SiO₂)
AI-generated identification · may be incorrectHardness is variable, about 2.5–4 for chrysocolla and 7 for quartz; blue-green to turquoise-green, commonly botryoidal or massive, with vitreous quartz and dull-to-waxy chrysocolla luster. Quartz is crystalline and often translucent; chrysocolla lacks prominent cleavage.
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Physical properties
Hardness is variable, about 2.5–4 for chrysocolla and 7 for quartz; blue-green to turquoise-green, commonly botryoidal or massive, with vitreous quartz and dull-to-waxy chrysocolla luster. Quartz is crystalline and often translucent; chrysocolla lacks prominent cleavage.
Formation & geological history
Forms as a secondary copper-mineral coating or replacement in oxidized zones of copper deposits, commonly with malachite, azurite, and limonite. Formation is generally geologically young relative to the host ore, occurring during weathering near the surface.
Uses & applications
Used as a lapidary and ornamental material, in cabochons and polished specimens; softer pieces are mainly collectible rather than suitable for everyday jewelry. It has minor historical use as a copper ore.
Geological facts
The vivid blue-green color comes from hydrated copper. The specimen appears to contain pale quartz or chalcedony with dark green chrysocolla and possibly malachite or matrix minerals.
Field identification & locations
Look for blue-green color, irregular massive texture, copper-stained matrix, and association with quartz, malachite, or azurite; avoid confusing it with turquoise, which is generally more uniformly opaque. Common sources include Arizona, Nevada, Mexico, Chile, Peru, and Australia.
