Green Aventurine
Quartz (Variety: Aventurine) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal; massive and granular habit with rarely visible hexagtonal prisms
Mineral Group
Silicates (Subgroup: Tectosilicates)
Chemical Formula
SiO2 with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
Formation Process
Metamorphic; typically forms in schists and quartzites under pressure where mica flakes are present
About This Crystal
A translucent to opaque green stone with a vitreous to waxy luster. It exhibits a distinctive sparkling or shimmering effect (aventurescence) caused by platy inclusions of green fuchsite mica.
Physical Characteristics
Color: Pale to forest green; Streak: White; Cleavage: None/Indistinct; Fracture: Conchoidal to splintery; Specific Gravity: 2.64–2.69; Fluorescence: Usually none, though some may show reddish fluorescence under LW UV.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: 0.009; Double Refraction; Phenomemon: Aventurescence (internal sparkle from inclusions).
Hardness & Durability
Origin Region
India (notably Karnataka and Andhra Pradesh), Brazil, and Russia
Hardness & Durability
Mohs Hardness: 6.5 - 7; Toughness: Good (slightly brittle due to inclusions); Excellent wearability for most jewelry types.
Care & Maintenance
Avoid long-term sun exposure as it may fade colors; clean with warm soapy water and a soft cloth; safe for most jewelry ultrasonic cleaners if no fractures are present.
Rarity & Value
Common; Value is determined by intensity of color and the amount of glitter (aventurescence); typically inexpensive and sold by weight as rough or tumbled stones.
Special Characteristics
Aventurescence (optical shimmer caused by mica platelets aligned within the quartz matrix); often confused with jade or emerald.
Lore & History
Historically known as the 'Stone of Opportunity' in various cultures; long associated with prosperity and luck. Often linked to the heart chakra in modern crystal healing traditions.