mineral
Chrysocolla on Quartz
Chrysocolla (Cu2−xAlx(H2−xSi2O5)(OH)4·nH2O) often associated with Quartz (SiO2)
AI-generated identification · may be incorrectHardness: 2-4 (Chrysocolla) / 7 (Quartz); Color: Cyan, turquoise-blue to bluish-green; Luster: Vitreous to earthy; Crystal Structure: Amorphous or monoclinic; Cleavage: None; Specific Gravity: 2.0-2.4
- Hardness
- 2-4 (Chrysocolla) / 7 (Quartz)
- Color
- Cyan, turquoise-blue to bluish-green
- Luster
- Vitreous to earthy
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Physical properties
Hardness: 2-4 (Chrysocolla) / 7 (Quartz); Color: Cyan, turquoise-blue to bluish-green; Luster: Vitreous to earthy; Crystal Structure: Amorphous or monoclinic; Cleavage: None; Specific Gravity: 2.0-2.4
Formation & geological history
Formed as a secondary copper mineral in the oxidation zones of copper ore bodies. It occurs as precipitates from hydrothermal fluids or circulating groundwater containing dissolved copper and silica.
Uses & applications
Primarily used as a minor ore of copper, a gemstone for jewelry (cabochons), and a highly sought-after mineral specimen for collectors.
Geological facts
Chrysocolla is often confused with turquoise but is generally softer. When it is infused within quartz, it is known as 'Stellarite' or 'Chrysocolla Chalcedony,' which is much harder and more durable for jewelry.
Field identification & locations
Identify by its distinctive blue-green color and its tendency to stick to the tongue due to its high silica and water content. Often found in Arizona (USA), Chile, Congo, and Peru.
