Aventurine (Green)
Quartz var. Aventurine · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal; typically found in massive habit rather than distinct crystals.
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 (with Fuchsite inclusions K(Al,Cr)2(AlSi3O10)(OH)2)
Formation Process
Metamorphic; typically forms in quartzites where recrystallization occurs under heat and pressure, trapping mica inclusions.
About This Crystal
A translucent to opaque green stone with a vitreous to waxy luster. It is characterized by 'aventurescence', a glistening effect caused by platy mineral inclusions.
Physical Characteristics
Color: Forest green; Streak: White; Fracture: Conchoidal to splintery; Specific Gravity: 2.64-2.69; Fluorescence: Usually inert but may show weak reddish tint under LWUV.
Optical Properties
Refractive Index: 1.544-1.553; Birefringence: 0.009; Optical Phenomenon: Aventurescence (shimmer caused by light reflecting off Fuchsite mica flakes).
Hardness & Durability
Origin Region
India (the primary source), Brazil, Russia, and Madagascar.
Hardness & Durability
Mohs Hardness: 6.5 to 7.0; Toughness: Fair to good; highly durable for jewelry use but slightly lower than pure quartz due to inclusions.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid prolonged exposure to harsh chemicals or extreme heat. Generally stable and not prone to fading.
Rarity & Value
Common; relatively inexpensive and widely available. Value is based on the intensity of the green color and the quality of the aventurescent shimmer.
Special Characteristics
Distinguished by aventurescence; often confused with jade, but identifiable by its distinct sparkly inclusions and granular texture.
Lore & History
Traditionally known as the 'Stone of Opportunity' and associated with the Heart Chakra. Historically used by Tibetans to improve nearsightedness and in ancient talismans.