metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
Hardness: 7 (Mohs scale); Color: Dark green with a shimmering effect; Luster: Vitreous to waxy; Crystal structure: Trigonal (hexagonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.64–2.69
- Hardness
- 7 (Mohs scale)
- Color
- Dark green with a shimmering effect
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Dark green with a shimmering effect; Luster: Vitreous to waxy; Crystal structure: Trigonal (hexagonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.64–2.69
Formation & geological history
Formed as a quartzite through regional metamorphism where intense heat and pressure recrystallize quartz-rich sedimentary rocks. The green color comes from chromium-rich fuchsite mica inclusions trapped during crystallization.
Uses & applications
Used extensively in jewelry (beads, cabochons), ornamental carvings, landscaping stones, and popular in crystal healing/metaphysical communities.
Geological facts
The name 'Aventurine' comes from the Italian word 'a ventura,' meaning 'by chance,' originally referring to the accidental discovery of 'aventurine glass' in Venice, which looks similar to this natural stone.
Field identification & locations
Identify in the field by its distinct 'aventurescence' (a metallic glitter caused by flat mineral inclusions). It is commonly found in India (the source of most commercial supply), Brazil, and Russia.
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