Chrysoprase
Quartz var. Chrysoprase · Semi-Precious Gemstone
Crystal System
Trigonal, microcrystalline crypto-crystalline quartz habit, massive aggregate
Mineral Group
Silicate, Tectosilicate subgroup
Chemical Formula
SiO2
Formation Process
Secondary alteration and hydrothermal/weathering processes involving nickel-rich solutions moving through silica-rich rocks.
About This Crystal
A tumbled, smooth, vibrant green chalcedony specimen with translucent to semi-translucent body, apple-green to bright emerald coloration, and a waxy to vitreous luster.
Physical Characteristics
Vibrant green color, white streak, conchoidal fracture, no distinct cleavage, specific gravity around 2.65, brittle tenacity, non-magnetic.
Optical Properties
Refractive index around 1.544 to 1.553, doubly refractive with aggregate birefringence, low dispersion, typically non-pleochroic.
Hardness & Durability
Origin Region
Australia, Poland, Brazil, Madagascar, USA. Forms in nickel-bearing serpentine deposits and weathering zones.
Hardness & Durability
Mohs hardness of 6.5 to 7, good toughness due to microcrystalline interlocking structure, durable for everyday jewelry wear.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid harsh chemicals, ultrasonic cleaners, and prolonged direct sunlight which can cause fading.
Rarity & Value
Uncommon to rare depending on color saturation and translucency. Valued by deep apple-green color rather than transparency. Moderate price range.
Special Characteristics
Colored by finely dispersed hydrated nickel silicates (such as reniérite or nickeliferous chlorite/smectite), giving it the distinctive apple-green hue compared to other green quartz varieties.
Lore & History
Historically worn by ancient Greeks, Romans, and Egyptians for its attractive green color. Associated with the heart chakra, emotional healing, compassion, and prosperity in modern crystal lore.