metamorphic
Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH,F)2)
Hardness: 6.5-7 (Mohs); Color: Green/Teal; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Hexagonal system); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.64-2.69; Distinctive feature: Aventurescence (shimmering effect).
- Hardness
- 6
- Color
- Green/Teal
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Green/Teal; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Hexagonal system); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.64-2.69; Distinctive feature: Aventurescence (shimmering effect).
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite. Its green color and shimmer are caused by tiny plate-like inclusions of green fuchsite mica that align during pressure and heating.
Uses & applications
Primarily used for ornamental carvings, jewelry (beads and cabochons), landscaping stones, and as a popular 'healing crystal' in the metaphysical community.
Geological facts
The name 'Aventurine' comes from the Italian word 'a ventura', meaning 'by chance'. This refers to the lucky discovery of aventurine glass (goldstone) in the 18th century, which looks very similar to this natural mineral.
Field identification & locations
Identify in the field by its grainy, quartzite-like texture and its characteristic 'sparkle' when rotated under light. Major deposits are found in India (near Karnataka), Brazil, and Russia.
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