Aventurine
Quartzite var. Aventurine (Quartz with Fuchsite inclusions) · Semi-Precious Gemstone
Crystal System
Trigonal crystal system; usually occurs in massive, microcrystalline aggregates without distinct crystal faces.
Mineral Group
Silicates (Tectosilicates / Quartz group)
Chemical Formula
SiO2 + K(Al,Cr)2AlSi3O10(OH)2
Formation Process
Metamorphic formation where quartz is subjected to heat and pressure, recrystallizing and trapping mica inclusions (fuchsite) which provide the green color.
About This Crystal
A medium to dark green, translucent to opaque stone with a vitreous to waxy luster. It often displays internal 'shimmer' caused by tiny platy mineral inclusions.
Physical Characteristics
Color is green; streak is white. It has no cleavage and a conchoidal to uneven fracture. Specific gravity is approximately 2.64-2.69. It is generally non-fluorescent.
Optical Properties
Refractive index of 1.544-1.553. Weakly doubly refractive. Displays 'aventurescence,' a sparkling or glistening effect caused by the reflection of light from tiny inclusions.
Hardness & Durability
Origin Region
Major sources include India (where most green aventurine originates), Brazil, Russia, and Tanzania. It forms in metamorphic environments and pegmatites.
Hardness & Durability
Mohs hardness of 6.5 to 7. It has good toughness and high durability, making it excellent for daily wear in necklaces and bracelets.
Care & Maintenance
Wash with warm soapy water and a soft cloth. Avoid harsh chemicals and ultrasonic cleaners if the stone has surface-reaching fractures. Stable under light and heat.
Rarity & Value
Common and affordable. Value is determined by the intensity of the green color and the quality of the aventurescence sparkle. Rarely treated, though some imitation stones are made of glass (Goldstone).
Special Characteristics
Aventurescence: a distinct optical phenomenon where the stone appears to glitter from within due to the orientation of fuchsite mica flakes.
Lore & History
Known as the Stone of Opportunity, it has been used in talismans for centuries. Historically linked to ancient Tibetan statues where it was used for eyes. Traditionally associated with the Heart Chakra and believed to bring luck and prosperity.