metamorphic
Green Aventurine
Silicon dioxide (SiO2) with inclusions of Fuchsite mica
Hardness: 6.5–7 on the Mohs scale. Color: Pale to deep green. Luster: Vitreous to waxy. Crystal Structure: Trigonal (hexagonal system). Cleavage: None (conchoidal fracture). Specific Gravity: 2.63 - 2.69. It features aventurescence, a shimmering effect caused by platy mineral inclusions.
- Hardness
- 6
- Color
- Pale to deep green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 on the Mohs scale. Color: Pale to deep green. Luster: Vitreous to waxy. Crystal Structure: Trigonal (hexagonal system). Cleavage: None (conchoidal fracture). Specific Gravity: 2.63 - 2.69. It features aventurescence, a shimmering effect caused by platy mineral inclusions.
Formation & geological history
Formed as a metamorphic quartzite under heat and pressure, where quartz recrystallizes with mica minerals. Its geological age varies by location, often associated with Precambrian formations.
Uses & applications
Predominantly used for jewelry (beads, cabochons), ornamental carvings, stone figurines, and as a popular 'healing' or meditation stone in the holistic community.
Geological facts
The name comes from the Italian 'a ventura,' meaning 'by chance,' referencing the discovery of aventurine glass (goldstone) in the 18th century, which looks similar to this natural stone.
Field identification & locations
Identify in the field by its distinct green sparkle (aventurescence) and quartz-like hardness. Primarily found in India (the largest producer), Brazil, Russia, and Tanzania. It is often confused with jade but is distinguishable by its grainy texture and shimmering inclusions.
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