Green Aventurine
Quartzite with Fuchsite inclusions (Quartz var. Aventurine) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal; typically occurs in massive crystalline aggregates or as thick beds rather than distinct crystals.
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2 (Quartz with Chromium-rich Mica inclusions)
Formation Process
Metamorphic; it is a quartzite formed from the metamorphism of sandstone, where the presence of Fuchsia mica develops during the recrystallization process.
About This Crystal
A translucent to opaque green stone with a grainy texture and a vitreous to waxy luster. In its raw form, it displays a sugary or schiller appearance caused by tiny mineral inclusions.
Physical Characteristics
Color: Pale to medium green. Streak: White. Cleavage: None. Fracture: Conchoidal to uneven. Specific Gravity: 2.64 - 2.69. Fluorescence: Generally inert, but may show weak green under LWUV.
Optical Properties
Refractive Index: ~1.544-1.553. Birefringence: 0.009. Shows 'aventurescence'—a shimmering effect caused by the reflection of light from flat mica platelets within the stone.
Hardness & Durability
Origin Region
Primarily India (Karnataka), Brazil, Russia, and Tanzania; often found in metamorphic environments or sedimentary beds.
Hardness & Durability
Mohs Hardness: 6.5 to 7. Fairly tough due to its interlocking crystal structure, making it highly durable for jewelry and carvings.
Care & Maintenance
Wash with warm soapy water. Resistant to most household chemicals but should be stored away from harder gemstones like Topaz or Sapphire to prevent scratching.
Rarity & Value
Common; very abundant and affordable. Value is determined by the intensity of the green color and the quality of the aventurescent shimmer. Rarely treated.
Special Characteristics
Distinguished by aventurescence, a metallic glitter caused by tiny flakes of green Fuchsite mica. Raw specimens often have a 'sugary' surface texture.
Lore & History
Known historically as a stone of prosperity and luck. Ancient Tibetans used it to adorn statues to improve the 'vision' of the deities. In modern lore, it is associated with the Heart Chakra and emotional calm.