metamorphic
Green Aventurine
Quartzite with Fuchsite (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5-7 on Mohs scale. Color: Pale to dark green with a shimmering effect (aventurescence). Luster: Vitreous to waxy. Structure: Trigonal (hexagonal) crystalline aggregate. Specific Gravity: 2.64-2.69.
- Hardness
- 6
- Color
- Pale to dark green with a shimmering effect (aventurescence)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Pale to dark green with a shimmering effect (aventurescence). Luster: Vitreous to waxy. Structure: Trigonal (hexagonal) crystalline aggregate. Specific Gravity: 2.64-2.69.
Formation & geological history
Formed through the regional metamorphism of quartz-rich sedimentary rocks (sandstone). The characteristic green color and shimmer are caused by tiny inclusions of green fuchsite mica. Formation typically occurs under high heat and pressure in tectonic belts.
Uses & applications
Primarily used in jewelry for pendants, beads, and cabochons. Also used for ornamental carvings, figurines, and as a popular 'healing stone' in metaphysical practices.
Geological facts
The name 'aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' referring to the 18th-century accidental discovery of aventurine glass (Goldstone) which mimics this stone's natural glitter.
Field identification & locations
Identify by its characteristic 'aventurescence' (metallic glimmer) and mossy green color. It is softer than pure quartz but harder than nephrite jade. Most commercial specimens are sourced from India, Brazil, and Russia.
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