Aventurine
Quartz var. Green Aventurine · Semi-Precious Gemstone and Decorative Stone
Crystal System
Trigonal, massive or microcrystalline quartz aggregate habit
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2 with Fuchsite (chromian muscovite) inclusions
Formation Process
Hydrothermal and metamorphic processes where microcrystalline quartz is infiltrated by chromium-rich mica flakes (fuchsite) during crystallization
About This Crystal
A polished round cabochon of rich green color featuring a distinctive dark linear inclusion running across the surface, displaying a translucent to opaque body with a vitreous to greasy luster when polished
Physical Characteristics
Green body color with white to colorless streak, conchoidal to uneven fracture, no distinct cleavage, specific gravity of approximately 2.65, brittle tenacity, and distinctive shimmering appearance caused by mineral inclusions
Optical Properties
Refractive index of 1.544 to 1.553, doubly refractive with low birefringence, uniaxial positive optical character, non-pleochroic, and exhibits aventurescence (a glistening metallic glitter effect)
Hardness & Durability
Origin Region
India, Brazil, Russia, Austria, and Tanzania; forms within quartz veins, pegmatites, and metamorphic schists
Hardness & Durability
Mohs hardness of 7, good durability and toughness, resistant to common chemicals, suitable for general jewelry use with standard care
Care & Maintenance
Clean with warm soapy water and a soft brush, avoid harsh chemical cleaners and prolonged exposure to direct sunlight, store separately to prevent scratching softer stones
Rarity & Value
Common and widely available, value is determined by color saturation, uniformity, and absence of distracting matrix inclusions, highly affordable for tumbled and cabochon specimens
Special Characteristics
Exhibits aventurescence, a glittering optical phenomenon caused by light reflecting off tiny flat reflective mineral inclusions such as fuchsite within the quartz matrix
Lore & History
Historically associated with good luck, prosperity, and abundance, frequently used in wealth amulets; in modern crystal healing traditions, it is tied to the heart chakra and believed to promote emotional tranquility and leadership qualities