Aventurine (Green)
Quartzite var. Aventurine · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal/Hexagonal system; typically found in massive, granular habits rather than distinct crystals
Mineral Group
Silicates (Tectosilicates)
Chemical Formula
SiO2 (with Fuchsite mica inclusions, KAl2(AlSi3O10)(OH)2)
Formation Process
Metamorphic formation where quartz is subjected to heat and pressure, recrystallizing with inclusions of mica or other minerals.
About This Crystal
A translucent to opaque green stone with a vitreous to waxy luster. Features a characteristic 'aventurescence'—a shimmering effect caused by platy mineral inclusions of green fuchsite mica.
Physical Characteristics
Color: Pale to forest green; Streak: White; Cleavage: None; Fracture: Conchoidal to splintery; Specific Gravity: 2.64-2.69; Fluorescence: Generally inert, may show weak red-brown.
Optical Properties
Refractive Index: 1.544-1.553; Birefringence: 0.009; Optical Effect: Aventurescence (shimmering caused by light reflecting off mica flakes).
Hardness & Durability
Origin Region
Major sources include India (Karnataka, Andhra Pradesh), Brazil, Russia, and Tanzania. Found in metamorphic rocks and hydrothermal veins.
Hardness & Durability
Mohs Hardness: 6.5 to 7. Good toughness and durability; excellent for jewelry and daily handling.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid prolonged exposure to harsh chemicals or extreme heat. Generally stable under sunlight.
Rarity & Value
Common; very affordable. Value is determined by the intensity of color and the quality of the shimmering aventurescence effect.
Special Characteristics
Displays 'aventurescence,' a distinct metallic glitter caused by tiny flakes of fuchsite mica oriented within the stone.
Lore & History
Historically used in Tibet for adorning statues to improve 'vision.' Modern lore associates it with the heart chakra, prosperity, and emotional tranquility.