gemstone
Aventurine Quartz
Silicon Dioxide (SiO2) with Fuchsite inclusions
Hardness 6.5-7 on Mohs scale; Color is pale to medium green; Vitreous to waxy luster; Trigonal crystal system; Conchoidal fracture; Grainy, quartzite-like texture.
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Physical properties
Hardness 6.5-7 on Mohs scale; Color is pale to medium green; Vitreous to waxy luster; Trigonal crystal system; Conchoidal fracture; Grainy, quartzite-like texture.
Formation & geological history
Formed in metamorphic environments where quartz-rich sandstone is transformed under heat and pressure into quartzite, often with chromium-rich mica (fuchsite) providing the green tint.
Uses & applications
Primarily used for decorative carvings, cabochons for jewelry, landscaping stones, and aquarium gravel.
Geological facts
The name comes from 'a ventura' (by chance), originally referring to Italian 'aventurine glass'. It is known for its 'aventurescence,' a shimmering effect caused by platy mineral inclusions.
Field identification & locations
Identify in the field by its green color, quartzite texture, and subtle internal shimmer. Common locations include India, Brazil, and Russia.
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