gemstone
Chrysoprase
Silicon Dioxide with Nickel inclusions (SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Apple-green to deep sea-green; Luster: Waxy to vitreous; Crystal Structure: Microcrystalline (trigonal); Cleavage: None, conchoidal fracture
- Hardness
- 6
- Color
- Apple-green to deep sea-green
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Apple-green to deep sea-green; Luster: Waxy to vitreous; Crystal Structure: Microcrystalline (trigonal); Cleavage: None, conchoidal fracture
Formation & geological history
Formed as a result of deep weathering or lateritization of nickel-bearing serpentinites or other ultramafic rocks in warm, humid climates.
Uses & applications
Highly prized as a gemstone for jewelry making (cabochons, beads, carvings), and as a valuable collector's mineral specimen.
Geological facts
Chrysoprase is one of the rarest and most valuable varieties of chalcedony quartz. Its vibrant green color comes from trace amounts of nickel compounds rather than chromium or vanadium as in emerald.
Field identification & locations
Can be identified in the field by its distinct waxy luster, conchoidal fracture, and apple-green hue associated with nickeliferous laterite deposits. Major sources include Western Australia, Queensland, Poland, Brazil, and Arizona.
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