Green Aventurine
Quartz var. Aventurine · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal; typically occurs in massive form without visible crystal faces.
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2 with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH)2)
Formation Process
Metamorphic; forms as a result of regional metamorphism in schist and quartzite or through hydrothermal activity where mica inclusions are trapped in quartz.
About This Crystal
A translucent to opaque green quartz with a sugary or shimmering luster known as aventurescence. The green color is derived from microscopic inclusions of chrome-rich Fuchsite mica. The specimen is carved into a polished pyramid.
Physical Characteristics
Color: Pale to forest green; Streak: White; Cleavage: None (indistinct); Fracture: Conchoidal to splintery; Specific Gravity: 2.64-2.69; Fluorescence: Weak greenish to none.
Optical Properties
Refractive Index: 1.544-1.553; Birefringence: 0.009; Optical Phenomenon: Aventurescence (glittering effect caused by light reflecting off mica inclusions); Singly or doubly refractive: Doubly.
Hardness & Durability
Origin Region
Notably India (majority of production), Brazil, Russia, and Tanzania. Found in metamorphic rocks and hydrothermal veins.
Hardness & Durability
Mohs Hardness: 6.5 to 7. Toughness is good due to its microcrystalline structure and mica inclusions. Good durability for jewelry.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners if the stone has heavy inclusions or fractures. Keep away from harsh acids and prolonged high heat.
Rarity & Value
Common and readily available. Value is determined by color intensity and the amount of aventurescence. Generally inexpensive, widely used for carvings and beads.
Special Characteristics
Aventurescence is the defining feature; it also occasionally shows subtle color zoning or darker green spots where mica concentration is higher.
Lore & History
Historically used in Tibetan statuary to 'empower' the eyes. Long known as a 'Stone of Opportunity.' Metaphysically associated with the Heart Chakra and believed to promote prosperity, emotional calm, and leadership.