mineral

Chrysoprase

Nickel-bearing Chalcedony (SiO2 with Ni impurities)

Hardness: 6.5-7 (Mohs); Color: Apple-green to deep sea-green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Cryptocrystalline; Specific Gravity: 2.6-2.64

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

Identified March 23, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Apple-green to deep sea-green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Cryptocrystalline; Specific Gravity: 2.6-2.64

Formation & geological history

Formed by the deep weathering (lateritization) of ultramafic rocks containing nickel. Nickel silicates leach into subterranean fractures to form cryptocrystalline quartz. It is generally found in Cenozoic geological formations.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons and beads) and ornamental carvings. It has been used historically as a decorative stone in architecture, such as in the palaces of Frederick the Great.

Geological facts

Known as the rarest and most valuable of the chalcedony quartz group. Unlike emerald which gets its green from chromium, chrysoprase gets its color from nickel. It was favored by Alexander the Great, who reportedly wore it into battle.

Field identification & locations

Identify in the field by its distinct apple-green color and waxy appearance. Commonly found in Western Australia (Marlborough and Yerilla), Poland, and Brazil. Collectors should look for uniform color and high translucency.

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