mineral
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
Hardness: 2.5-3.5 (can be higher if silicated); Color: Blue-green, turquoise-blue; Luster: Vitreous to earthy; Crystal System: Orthorhombic (rarely crystalline); Specific Gravity: 2.0-2.4
- Hardness
- 2
- Color
- Blue-green, turquoise-blue
- Luster
- Vitreous to earthy
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Physical properties
Hardness: 2.5-3.5 (can be higher if silicated); Color: Blue-green, turquoise-blue; Luster: Vitreous to earthy; Crystal System: Orthorhombic (rarely crystalline); Specific Gravity: 2.0-2.4
Formation & geological history
Secondary mineral formed in the oxidation zones of copper ore bodies. It occurs as precipitate from hydrothermal solutions and as a weathering product of copper minerals like malachite or azurite.
Uses & applications
Minor ore of copper, popular gemstone for cabochons and beads, and highly sought after by mineral collectors for its vibrant color.
Geological facts
Chrysocolla is often confused with turquoise but is generally softer; it is frequently found intergrown with quartz, which makes it hard enough for jewelry use (known as Gem Silica).
Field identification & locations
Look for its signature 'robin egg' blue or vivid green color in copper-rich mining districts. It will often stick to the tongue due to its porous nature. Commonly found in Arizona (USA), Chile, and the DRC.
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Schist
Schist
Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
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Gypsum (variety Selenite or Alabaster)
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Mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic