Green Aventurine
Quartzite var. Green Aventurine · Semi-Precious Gemstone; Decorative Stone
Crystal System
Trigonal; typically occurs in massive or granular form rather than distinct crystals.
Mineral Group
Silicates (Tectosilicate group saturated with Cr-Muscovite)
Chemical Formula
SiO2 + K(Al,Cr)2AlSi3O10(OH)2
Formation Process
Metamorphic; forms through the regional metamorphism of quartz-rich sediments where chromium-rich Fuchsite mica is included as an impurity.
About This Crystal
An opaque to translucent green variety of quartzite characterized by 'aventurescence'—a shimmering effect caused by platy mineral inclusions. The specimen is carved into a polished pyramid with a waxy to vitreous luster and a muted forest-green hue.
Physical Characteristics
Color: Pale to deep green; Streak: White; Cleavage: None; Fracture: Conchoidal to uneven; Specific Gravity: 2.64–2.69; Fluorescence: Generally inert but may show weak reddish-brown under LWUV.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: 0.009; Optical Phenomenon: Aventurescence (metallic glitters caused by Fuchsite mica scales).
Hardness & Durability
Origin Region
India (major source), Brazil, Russia, and Tanzania.
Hardness & Durability
Mohs Hardness: 6.5–7; Toughness: Very good due to its interlocking granular structure; highly durable for jewelry and carvings.
Care & Maintenance
Wash with warm soapy water; safe for ultrasonic cleaners in most cases. Store away from harder stones like Topaz or Diamonds to prevent scratching.
Rarity & Value
Common; Value is determined by the intensity of green and the quality ofaventurescence. Generally affordable ($5-$30 for decorative carvings).
Special Characteristics
Aventurescence - the spangled, shimmering visual effect caused by the reflection of light from tiny inclusions of chrome-mica (Fuchsite).
Lore & History
Historically used as a 'Stone of Opportunity' or luck. In ancient Ethiopia, it was used to create tools. In modern crystal healing, it is associated with the Heart Chakra and believed to promote prosperity and emotional calm.