Aventurine
Quartzite var. Aventurine · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal/Hexagonal system; usually occurs in a massive or microcrystalline habit.
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 (with inclusions of Fuchsite mica or Hematite)
Formation Process
Metamorphic; forms as a result of the metamorphism of quartz sandstone, where the presence of chrome-rich mica (fuchsite) creates a green color and platy inclusions.
About This Crystal
A translucent to opaque light green rock with a grainy or sugary texture. It exhibits a dull to slightly waxy luster in its raw state with visible platy mineral inclusions.
Physical Characteristics
Color: Pale green; Streak: White; Cleavage: None/Indistinct; Fracture: Granular or splintery; Specific Gravity: 2.64-2.69; Lacks natural fluorescence.
Optical Properties
Refractive Index: 1.544-1.553; exhibit 'aventurescence' (a metallic glitter caused by light reflecting off internal mica flakes); Uniaxial positive.
Hardness & Durability
Origin Region
India, Brazil, Russia, and Tanzania; typically found in metamorphic terrains.
Hardness & Durability
Mohs hardness: 6.5 to 7.0; Good toughness due to its interlocking crystalline structure; Stable under most conditions.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid harsh chemicals; safe for ultrasonic cleaning if no significant fractures are present.
Rarity & Value
Common; value is determined by the intensity of color and the amount of aventurescence; generally affordable collector specimens.
Special Characteristics
Aventurescence: a distinct play of light/glitter caused by the reflection of light from platy inclusions within the stone.
Lore & History
Historically known as the 'Stone of Opportunity'; used in jewelry and decorative carvings since ancient times; traditionally associated with prosperity and the Heart Chakra.