Rock Identifier
Chrysoprase (Chalcedony (cryptocrystalline silica containing nickel); Chemical Formula: SiO2 with Ni impurities) — mineral
mineral

Chrysoprase

Chalcedony (cryptocrystalline silica containing nickel); Chemical Formula: SiO2 with Ni impurities

Hardness: 6.5–7 on the Mohs scale; Color: Apple-green to deep sea-green; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58–2.64.

Hardness
6
Color
Apple-green to deep sea-green
Luster
Vitreous to waxy
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Physical properties

Hardness: 6.5–7 on the Mohs scale; Color: Apple-green to deep sea-green; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58–2.64.

Formation & geological history

Formed as a result of the deep weathering or lateritization of nickeliferous serpentinites or other ultramafic rocks in humid climates. Predominantly found in Cenozoic deposits.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons and beads) and decorative ornamental carvings. It is the most valuable variety of chalcedony.

Geological facts

The name comes from the Greek 'chrysos' (gold) and 'prason' (leek). It was a favorite of Alexander the Great and Frederick the Great of Prussia, who used it to decorate the halls of his palace, Sanssouci.

Field identification & locations

Identify by its distinct apple-green hue and waxy translucency. Common locations include Australia (Queensland and Western Australia), Germany, Poland, Russia, and Arizona, USA. It is often found as veins fill or nodules in weathered bedrock.

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