Green Aventurine
Quartz var. Aventurine · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal; massive habit with no visible external crystal faces, showing a granular texture
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2 (Silicon Dioxide) with KAl2(AlSi3O10)(OH)2 (Fuchsite mica) inclusions
Formation Process
Metamorphic; forms as a result of regional metamorphism where quartz-rich sediments or igneous rocks recrystallize, incorporating mica flakes
About This Crystal
A translucent to opaque green stone with a vitreous to waxy luster. It exhibits a granular, sugary texture with visible shimmering mineral inclusions throughout the matrix.
Physical Characteristics
Pale to medium green color with a white streak. It has no cleavage, a conchoidal to splintery fracture, and a specific gravity of 2.64-2.69. It is non-fluorescent.
Optical Properties
Refractive index of 1.544-1.553. Characterized by 'aventurescence,' a shimmering effect caused by light reflecting off platy inclusions of green Fuchsite mica.
Hardness & Durability
Origin Region
Primarily India (Karnataka, Andhra Pradesh), Brazil, and Russia; typically found in metamorphic schists
Hardness & Durability
Mohs hardness of approximately 6.5 to 7. It is quite tough and durable for daily wear, though the mica inclusions can create slight structural weakness.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners if the stone has significant fractures. Generally stable under sunlight and household chemicals.
Rarity & Value
Common and widely available. Value is determined by the intensity of the green color and the quality of the aventurescence; usually very affordable as carvings or tumble stones.
Special Characteristics
Aventurescence (shimmering metallic glints); contains Fuchsite (chromium-rich muscovite) which provides the characteristic green pigmentation.
Lore & History
Historically used in Ethiopia for tools and in ancient jewelry. Associated with prosperity and the 'Stone of Opportunity' in modern folklore, traditionally linked to the heart chakra.