mineral
Chrysoprase
Chalcedony (Silicon Dioxide, SiO2)
Hardness: 6.5–7; Color: Apple-green to deep green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.6
- Hardness
- 6
- Color
- Apple-green to deep green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7; Color: Apple-green to deep green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.6
Formation & geological history
Formed by the deep weathering or lateritization of nickeliferous serpentinites or other ultramafic rocks. The green color is caused by trace amounts of nickel.
Uses & applications
Primary use is in jewelry as cabochons or beads, and for ornamental carvings. It is the most valuable variety of chalcedony.
Geological facts
In ancient times, Chrysoprase was associated with Alexander the Great, who was said to always wear a belt decorated with it for victory in battle.
Field identification & locations
Identify by its distinct waxy luster and apple-green hue. Unlike emerald, which is colored by chromium, chrysoprase's color comes from nickel inclusions. Commonly found in Australia, Brazil, and Poland.
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mineral