mineral

Botryoidal chrysocolla with malachite

Chrysocolla (hydrated copper aluminosilicate) with malachite (Cu₂CO₃(OH)₂), possibly quartz/matrix

AI-generated identification · may be incorrect

Blue-green to turquoise, commonly botryoidal with dull to waxy luster; chrysocolla is soft (Mohs 2.5–3.5), malachite 3.5–4. Cleavage is poor to indistinct, and the specimen appears as an earthy, irregular copper-mineral aggregate rather than distinct crystals.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Forms in oxidized zones above copper-ore deposits when copper-rich fluids react with silica- and carbonate-bearing rock. Most examples are Cenozoic to older, with age dependent on the host deposit.

Uses & applications

Used as a decorative and lapidary material, cabochons, beads, and mineral specimens; malachite has also been historically used as pigment. Chrysocolla is generally too soft for durable jewelry unless stabilized.

Geological facts

Botryoidal surfaces are rounded, grape-like growths produced by repeated mineral deposition. Blue chrysocolla intergrown with green malachite is a classic copper-oxide-zone association.

Field identification & locations

Identify by turquoise-blue and green color, botryoidal texture, softness, and association with brown or gray host rock; common localities include Arizona, Nevada, Chile, Peru, Congo, and Australia. Avoid acids and prolonged water exposure.