mineral
Polished chrysocolla-matrix stone (probable)
Chrysocolla, hydrated copper aluminosilicate; likely mixed with quartz, turquoise, or copper minerals
AI-generated identification · may be incorrectBlue-green to gray mottling with a dull-to-waxy polished luster; typically amorphous, hardness about 2.5–4, with no distinct cleavage. Exact properties vary greatly because commercial specimens are commonly mineral mixtures or stabilized composites.
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Physical properties
Blue-green to gray mottling with a dull-to-waxy polished luster; typically amorphous, hardness about 2.5–4, with no distinct cleavage. Exact properties vary greatly because commercial specimens are commonly mineral mixtures or stabilized composites.
Formation & geological history
Forms as a secondary copper mineral in oxidized zones of copper deposits, often replacing or coating host rock; commonly Cenozoic to older, depending on the deposit.
Uses & applications
Used for cabochons, tumbled stones, carvings, and ornamental objects; too soft and variable for most durable jewelry unless stabilized.
Geological facts
The blue-green color comes from hydrated copper-bearing minerals. Chrysocolla is frequently confused with turquoise, but it is generally softer and more vitreous-to-waxy rather than opaque, hard, and porcelain-like.
Field identification & locations
Look for irregular blue-green patches, coppery green hues, low hardness, and association with quartz or dark matrix; avoid acids and prolonged soaking. Common sources include Arizona, Nevada, Chile, Peru, Mexico, and the Democratic Republic of the Congo.
