mineral
Blue-green copper mineral specimen, likely chrysocolla
Chrysocolla, hydrated copper phyllosilicate — approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; possibly mixed with turquoise or malachite
AI-generated identification · may be incorrectBright blue-green, earthy to slightly vitreous luster, usually massive or botryoidal rather than visibly crystalline; Mohs hardness 2.5–3.5, poor cleavage, specific gravity about 2.0–2.4. The rough, mottled texture and turquoise-blue color fit chrysocolla, though a photo cannot confirm the identification.
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Physical properties
Bright blue-green, earthy to slightly vitreous luster, usually massive or botryoidal rather than visibly crystalline; Mohs hardness 2.5–3.5, poor cleavage, specific gravity about 2.0–2.4. The rough, mottled texture and turquoise-blue color fit chrysocolla, though a photo cannot confirm the identification.
Formation & geological history
Forms as a secondary copper mineral in oxidized zones of copper deposits, where acidic groundwater alters primary copper sulfides; commonly associated with malachite, azurite, quartz, and limonite. It is generally geologically young relative to its host ore, forming during later weathering stages.
Uses & applications
Used as a decorative and lapidary stone, in cabochons and carvings, and occasionally as a copper ore; attractive specimens are collected. It is too soft and porous for durable everyday jewelry unless stabilized or protected.
Geological facts
Chrysocolla is often intergrown with turquoise, quartz, and copper oxides, producing misleading trade names such as “chrysocolla turquoise.” It may darken or become chalky with acids, heat, or prolonged moisture exposure.
Field identification & locations
Common localities include Arizona, Nevada, New Mexico, Chile, Peru, the Democratic Republic of Congo, and Australia. Confirm with copper-green streak, low hardness, acid sensitivity, and ideally Raman/XRF testing; value is typically $5–$30 for a small rough piece, or $30–$150+ for vivid, high-quality specimens.
