mineral
Chrysocolla
Chrysocolla (Cu2–xAlx(H2–xSi2O5)(OH)4·nH2O)
Hardness: 2.5-3.5 (can be higher if mixed with quartz); Color: Cyan, turquoise, or green-blue; Luster: Vitreous to dull; Crystal structure: Amorphous/Monoclinic; Specific gravity: 2.0-2.4
- Hardness
- 2
- Color
- Cyan, turquoise, or green-blue
- Luster
- Vitreous to dull
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Physical properties
Hardness: 2.5-3.5 (can be higher if mixed with quartz); Color: Cyan, turquoise, or green-blue; Luster: Vitreous to dull; Crystal structure: Amorphous/Monoclinic; Specific gravity: 2.0-2.4
Formation & geological history
Forms in the oxidation zones of copper ore bodies as a secondary mineral. It is often found associated with quartz, malachite, and azurite in arid climates.
Uses & applications
Used primarily as a gemstone for jewelry (cabochons) and as a minor ore of copper. It is highly valued by mineral collectors for its vibrant color.
Geological facts
Chrysocolla was used by ancient Greeks as a soldering agent for gold. Its name is derived from the Greek words 'chrysos' (gold) and 'kolla' (glue). It is often mistaken for turquoise but is generally softer.
Field identification & locations
Identify in the field by its distinctive blue-green color and its tendency to stick to the tongue due to its porous nature. Commonly found in Arizona (USA), Chile, and the DRC.
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