mineral

Chrysoprase

Nickel-bearing Chalcedony (SiO2 with inclusions of Ni-compounds like kerolite or pimelite)

AI-generated identification · may be incorrect

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

Identified July 9, 2026More mineral →

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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.