metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Hardness: 6.5-7 on Mohs scale; Color: Translucent to opaque light-to-dark green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69
- Hardness
- 6
- Color
- Translucent to opaque light-to-dark green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Translucent to opaque light-to-dark green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69
Formation & geological history
Formed as a sedimentary sandstone that undergoes metamorphism to become quartzite. Its green color and 'aventurescence' (shimmer) are caused by tiny platy inclusions of green chromium-rich mica called fuchsite.
Uses & applications
Widely used in jewelry (cabochons, beads), decorative carvings, aquarium gravel, and as a popular 'healing crystal' in metaphysical practices.
Geological facts
The name 'aventurine' comes from the Italian 'a ventura,' meaning 'by chance.' This refers to the 18th-century discovery of Goldstone glass, which looks similar to this natural stone.
Field identification & locations
Identify by its characteristic 'aventurescence' (a metallic glitter seen when moved under light) and its green color combined with a granular, quartz-like texture. Commonly found in India, Brazil, and Russia.
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