mineral

Chrysoprase

Silicon dioxide with nickel impurities (SiO2 + Ni)

Hardness: 6.5-7 Mohs; Color: Apple green to deep olive; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None; Specific gravity: 2.6-2.9

Hardness: 6
Color: Apple green to deep olive
Luster: Vitreous to waxy

Identified April 4, 2026More mineral →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Apple green to deep olive; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None; Specific gravity: 2.6-2.9

Formation & geological history

Formed as a result of the deep weathering or lateritization of nickeliferous serpentinites or other ultramafic ophiolite rocks. The green color is derived from small inclusions of nickel-bearing minerals like kerolite or pimelite.

Uses & applications

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

Geological facts

Ancient Romans and Greeks used chrysoprase for seals and signets. It was a favorite of Frederick the Great of Prussia, who decorated his palace at Potsdam with it. It is often mistaken for imperial jade due to its translucency.

Field identification & locations

Identify by its unique 'apple green' color and lack of banding (unlike agate). Commonly found in Australia (Queensland and Western Australia), Brazil, Poland, and the United States (Arizona and California). Collectors look for high translucency and uniform color.

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