Rock Identifier
Chrysocolla-bearing copper ore (Chrysocolla (hydrated copper aluminosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O), likely with malachite, quartz, and iron oxides) — mineral
mineral

Chrysocolla-bearing copper ore

Chrysocolla (hydrated copper aluminosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O), likely with malachite, quartz, and iron oxides

AI-generated identification · may be incorrect

Blue-green to turquoise coatings and massive patches occur in a dark, irregular host; luster is earthy to vitreous, with no obvious cleavage. Chrysocolla is soft (Mohs 2.5–3.5), while associated quartz and sulfides are harder; specific gravity is commonly about 2.0–2.4 for chrysocolla-rich material.

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Physical properties

Blue-green to turquoise coatings and massive patches occur in a dark, irregular host; luster is earthy to vitreous, with no obvious cleavage. Chrysocolla is soft (Mohs 2.5–3.5), while associated quartz and sulfides are harder; specific gravity is commonly about 2.0–2.4 for chrysocolla-rich material.

Formation & geological history

Forms as a secondary copper-mineral deposit in the oxidized zone above copper sulfide ores, commonly through weathering of chalcopyrite and related minerals. Such specimens may range from ancient ore bodies to recently collected surface material; age depends on the deposit.

Uses & applications

Used as a decorative lapidary material, cabochons, beads, and mineral specimens; copper-bearing ore is economically important where grade is high. The pictured rough pieces have modest collector value.

Geological facts

Chrysocolla’s vivid color can resemble turquoise, but it is generally softer and commonly occurs with green malachite, blue azurite, quartz, and brown iron oxides.

Field identification & locations

Common localities include Arizona, Nevada, Chile, Peru, the Democratic Republic of Congo, and Australia. Field identification relies on blue-green color, soft massive texture, copper staining, and association with malachite or azurite; avoid acids and prolonged water exposure.