Green Aventurine
Quartz var. Aventurine · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal; usually found in massive crystalline aggregates or tumbled forms.
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 (with Fuchsite inclusions K(Al,Cr)2(AlSi3O10)(OH)2)
Formation Process
Metamorphic; it forms through the metamorphism of sandstone into quartzite where chromium-rich mica (fuchsite) is present and oriented within the quartz matrix.
About This Crystal
Medium green to forest green with a waxy to vitreous luster. It is translucent to opaque with visible shimmering inclusions and a slightly grainy texture.
Physical Characteristics
Color: Green; Streak: White; Cleavage: None; Fracture: Conchoidal to splintery; Specific Gravity: 2.64-2.69; Fluorescence: Generally inert.
Optical Properties
Refractive Index: 1.544-1.553; Birefringence: 0.009; Displays aventurescence (a shimmering effect caused by light reflecting off platy inclusions of fuchsite mica).
Hardness & Durability
Origin Region
India (Karnataka), Brazil, Russia, Austria, and Tanzania; typically found in metamorphic environments and recrystallized quartzites.
Hardness & Durability
Mohs hardness: 6.5 to 7; Good toughness and stability for jewelry, though softer than pure quartz due to mica inclusions.
Care & Maintenance
Wash with warm soapy water; safe for most cleaners but avoid prolonged exposure to harsh chemicals. Store away from harder gems like Topaz or Sapphire to avoid scratching.
Rarity & Value
Common; very affordable. Value is determined by the intensity of green color and the richness of the aventurescence (sparkle factor). Rarely treated.
Special Characteristics
Aventurescence: An optical phenomenon where reflective mica inclusions create a sparkly, metallic glittering appearance when rotated in light.
Lore & History
Historically used in Tibet to improve nearsightedness and represent the 'insight' of statues. In modern crystal lore, it is known as the 'Stone of Opportunity' and associated with the Heart Chakra.