mineral
Polished chrysocolla cabochon
Chrysocolla, hydrated copper aluminum silicate; commonly mixed with malachite, quartz, or turquoise
AI-generated identification · may be incorrectTypically blue-green to teal with mottled black or green patterns and a glassy-to-waxy polish; Mohs hardness 2–4 (variable), generally opaque, with no visible cleavage and botryoidal or massive structure.
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Physical properties
Typically blue-green to teal with mottled black or green patterns and a glassy-to-waxy polish; Mohs hardness 2–4 (variable), generally opaque, with no visible cleavage and botryoidal or massive structure.
Formation & geological history
Forms as a secondary copper mineral in oxidized zones of copper deposits, often replacing or coating host rock. It is commonly Cenozoic to older, depending on the deposit.
Uses & applications
Used mainly for cabochons, beads, carvings, and ornamental stone; softer material is jewelry-grade only when stabilized or protected. Common specimens are affordable collector pieces.
Geological facts
The vivid color comes from copper; chrysocolla is frequently intergrown with malachite and quartz, producing complex patterns like those visible here.
Field identification & locations
Identify it by its blue-green color, irregular mottling, low hardness, and association with copper minerals; common sources include Arizona, Nevada, Chile, Peru, Mexico, and the Democratic Republic of the Congo.
