Chrysocolla Composition, Crystallization & Structure
Composition. Hydrous copper silicate, whose formula is near CuSi03.2H20. Varies considerably in composition and often impure, and is commonly considered to be usually a solid solution of CuO, Si02 and H20 in varying proportions.
Structure. Has been observed in small, acicular crystals but cornmonly cryptocrystalline or amorphous. Massive compacto Sometimes earthy.
Physical Properties. H. = 2-4. G. = 2.0-2.4. Luster vitreous to earthy. Color green to greenish blue; brown to black when impure.
Tests. Infusible. Decomposed by hydrochloric acid with the separation of silica but without the formation of a jelly. Gives a copper globule when fused with sodium carbonate on charcoal. In C. T. darkens and gives water. .
Occurrence. A mineral of secondary origin, occurring in the oxidized zones of copper veins. Associated with malachite, azurite, cuprite, native copper, etc. Found in the copper districts of Arizona and New Mexico. In microscopic crystals from Mackay, Idaho.
Name. Chrysocolla, derived from two Greek words meaning gold and glue, which was the name of a similar appearing material used to solder gold.
Use. A minor ore of copper.
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