Aventurine
Quartz var. Green Aventurine · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal, massive or granular aggregate habit
Mineral Group
Silicates, Tectosilicates
Chemical Formula
SiO2 with fuchsite inclusions
Formation Process
Metamorphic formation through regional metamorphism of quartz-rich sandstones with chromium-rich mica minerals under moderate temperatures and pressures
About This Crystal
A small, tumbled, light green stone showing a glittering or shimmering effect known as aventurescence, caused by tiny flat reflective inclusions of chromium-rich muscovite mica (fuchsite)
Physical Characteristics
Light green body color with a white streak, sub-vitreous to greasy luster, translucent to opaque transparency, conchoidal fracture, no distinct cleavage, specific gravity of approximately 2.65
Optical Properties
Singly refractive or pseudo-uniaxial positive, uniaxial optic sign with low birefringence (0.009), displaying aventurescence due to metallic plate inclusions
Hardness & Durability
Origin Region
India, Brazil, Russia, Austria, and Tanzania; typically found in metamorphic quartzites and pegmatites
Hardness & Durability
Mohs hardness of 7, good durability, resistant to scratching by most common household items, tough due to microcrystalline interlocking quartz structure
Care & Maintenance
Easy to clean with warm soapy water and a soft brush, avoid harsh chemical cleaners, store separately to prevent scratching softer stones, generally stable in light and heat
Rarity & Value
Common, highly affordable, value determined by uniform color saturation and intensity of the glittering aventurescence effect
Special Characteristics
Aventurescence - a metallic glitter effect produced by light reflecting off tiny parallel inclusion platelets suspended within the quartz matrix
Lore & History
Often referred to as the stone of opportunity and prosperity, traditionally associated with the heart chakra, luck, and emotional calmness in modern crystal healing practices