metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Hardness: 6.5-7 on Mohs scale; Color: Translucent green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific Gravity: 2.64-2.69
- Hardness
- 6
- Color
- Translucent green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Translucent green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific Gravity: 2.64-2.69
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite, where mica crystals (fuchsite) are trapped within the quartz matrix, creating the characteristic green shimmer known as aventurescence. Primarily found in Precambrian shield areas.
Uses & applications
Used extensively in jewelry for beads, cabochons, and carvings. Also used as a decorative stone in aquariums, gardens, and countertop surfaces.
Geological facts
The name 'aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' referencing the accidental discovery of aventurine glass in the 18th century which looked similar to this natural stone.
Field identification & locations
Identify by its 'shimmer' or 'glitter' caused by mica inclusions (aventurescence). It is commonly found in India, Brazil, and Russia. Collectors should look for a uniform green color and a strong shimmering effect.
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