Chrysoprase
Quartz var. Chrysoprase · Semi-Precious Gemstone
Crystal System
Trigonal, microcrystalline crypto-crystalline habit forming massive or cabochon shapes
Mineral Group
Silicates, specifically Tectosilicates
Chemical Formula
SiO2
Formation Process
Secondary low-temperature hydrothermal or weathering processes, forming in nickeliferous magnesite veins
About This Crystal
A smooth, polished cabochon displaying a vibrant apple-green color, with a translucent to opaque body and a waxy to vitreous luster
Physical Characteristics
Apple-green to yellowish-green body color, white streak, conchoidal fracture, no cleavage, specific gravity around 2.60 to 2.65, brittle tenacity
Optical Properties
Refractive index of approximately 1.540 to 1.553, doubly refractive with microcrystalline aggregate birefringence, non-pleochroic
Hardness & Durability
Origin Region
Australia, Poland, Brazil, and the USA, forming in nickel-bearing weathered serpentinites
Hardness & Durability
Mohs hardness of 6.5 to 7, good durability for everyday jewelry wear despite being microcrystalline quartz
Care & Maintenance
Clean with warm soapy water using a soft brush, avoid harsh chemicals, prolonged exposure to direct sunlight may cause fading
Rarity & Value
Uncommon variety of chalcedony, value determined by intensity of apple-green color and transparency, generally moderate price range
Special Characteristics
Colored by finely dispersed hydrated nickel silicates (such as garnierite), lacks distinct cleavage, smooth polished texture
Lore & History
Historically prized by the ancient Greeks, Romans, and Egyptians for signet rings and amulets; traditionally associated with the heart chakra, compassion, and emotional healing