mineral
Chrysoprase
Nickel-bearing Chalcedony (SiO2 with inclusions of Ni-compounds like kerolite or pimelite)
Hardness: 6-7 on Mohs scale; Color: apple-green to deep green; Luster: vitreous to waxy; Crystal structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: none; Specific Gravity: 2.6-2.64
- Hardness
- 6-7 on Mohs scale
- Color
- apple-green to deep green
- Luster
- vitreous to waxy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: apple-green to deep green; Luster: vitreous to waxy; Crystal structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: none; Specific Gravity: 2.6-2.64
Formation & geological history
Formed through the deep weathering of nickeliferous rocks (ultramafic rocks like serpentinites) in tropical or subtropical climates. It occurs as veins or nodules within the weathered profile.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons, beads, rings) and for decorative carvings or ornamental stones.
Geological facts
Chrysoprase is the most valuable variety of chalcedony. Its green color comes from nickel rather than chromium or vanadium, which color emeralds. It was a favorite of Frederick the Great of Prussia, who used it to decorate his palace.
Field identification & locations
Identify by its distinctive 'apple-green' color and waxy luster. In the field, look for green seams within oxidized brown iron-rich rock (gossan) or weathered serpentine. Major deposits are in Australia (Queensland), Poland, and Tanzania.
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