mineral
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
AI-generated identification · may be incorrectHardness: 2.5-3.5 on Mohs scale; Color: Cyan, blue-green, or emerald green; Luster: Vitreous to dull; Crystal structure: Orthorhombic (usually cryptocrystalline); Specific gravity: 2.0-2.4
- Hardness
- 2
- Color
- Cyan, blue-green, or emerald green
- Luster
- Vitreous to dull
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Physical properties
Hardness: 2.5-3.5 on Mohs scale; Color: Cyan, blue-green, or emerald green; Luster: Vitreous to dull; Crystal structure: Orthorhombic (usually cryptocrystalline); Specific gravity: 2.0-2.4
Formation & geological history
Secondary mineral formed in the oxidation zones of copper ore bodies. It occurs as encrustations, vein fillings, or botryoidal masses often associated with quartz, malachite, and azurite.
Uses & applications
Informal copper ore, popular minor gemstone for cabochons and beads, and highly sought after by mineral collectors for its vibrant color.
Geological facts
Chrysocolla is often confused with turquoise. The name is derived from the Greek words 'chrysos' (gold) and 'kolla' (glue), referring to the name of the material used to solder gold in ancient times.
Field identification & locations
Identify by its bright blue-green color and lack of reaction to HCl (unlike malachite). It is often found in arid regions like Arizona, Chile, and the Democratic Republic of Congo. Sticks slightly to the tongue due to its high water content.
