metamorphic
Aventurine
Quartzite (SiO2 with inclusions)
Hardness: 6.5-7 (Mohs scale), Color: Green (from Fuchsite), Luster: Vitreous to waxy, Crystal Structure: Hexagonal/Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.64-2.69. It displays 'aventurescence' which is a shimmering effect.
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Green (from Fuchsite), Luster: Vitreous to waxy, Crystal Structure: Hexagonal/Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.64-2.69. It displays 'aventurescence' which is a shimmering effect.
Formation & geological history
Aventurine is a form of quartzite, which is a metamorphic rock formed when quartz-rich sandstone is subjected to high heat and pressure. The green color is typically caused by inclusions of green chrome-mica (fuchsite). Most deposits are hundreds of millions of years old.
Uses & applications
Widely used for ornamental carvings, jewelry (cabochons and beads), landscaping stones, and aquarium decorations. It is often used as a more affordable substitute for jade.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to the 18th-century accidental discovery of aventurine glass (goldstone). It is known among collectors as the 'Stone of Opportunity.'
Field identification & locations
Identify by its distinct shimmering metallic flakes (aventurescence) and its ability to scratch glass but not be scratched by steel. It is commonly found in India, Brazil, Russia, and Madagascar.
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