metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Hardness: 6.5-7 (Mohs); Color: Pale to deep green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.64-2.69; Distinctive feature: Aventurescence (shimmer caused by light reflecting off inclusions).
- Hardness
- 6
- Color
- Pale to deep green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Pale to deep green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.64-2.69; Distinctive feature: Aventurescence (shimmer caused by light reflecting off inclusions).
Formation & geological history
Formed as a metamorphic rock (quartzite) through the alteration of quartz-rich sandstones and subsequent crystallization of mica (Fuchsite) under high heat and pressure. Most specimens date from the Precambrian to Paleozoic eras.
Uses & applications
Predominantly used for lapidary work, jewelry (beads, cabochons), carvings, decorative ornaments, and widely sold in the metaphysical market.
Geological facts
The name comes from the Italian word 'a ventura', meaning 'by chance', which originally referred to the accidental glass discovery in the 18th century that looked similar to this natural stone.
Field identification & locations
Identify in the field by its grainy, sugary surface texture and the characteristic internal 'glitter' when rotated under light. Common locations include India (the primary source), Brazil, Russia, and South Africa.
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