metamorphic
Green Aventurine (Tumbled)
Quartz (SiO2) containing Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5-7 (Mohs); Color: Pale to deep green; Luster: Vitreous to waxy; Structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.6-2.7
- Hardness
- 6
- Color
- Pale to deep green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Pale to deep green; Luster: Vitreous to waxy; Structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.6-2.7
Formation & geological history
Formed in metamorphic environments where quartz-rich rocks undergo intense pressure and heat. The green color is derived from inclusions of chromium-rich mica known as fuchsite. These rocks are usually from the Precambrian era, dating back billions of years.
Uses & applications
Predominantly used as a semi-precious gemstone in jewelry, beads, and carvings. Also used in industrial applications for its hardness and as an ornamental stone in landscaping or decor.
Geological facts
Known as the 'Stone of Opportunity,' it exhibits an optical phenomenon called 'aventurescence,' which is a shimmering effect caused by light reflecting off tiny platelets of mica within the stone.
Field identification & locations
Identify in the field by its distinct green hue and internal sparkles (aventurescence) when turned under light. Common locations include India, Brazil, Russia, and Tanzania. Collectors should look for even color saturation and a strong glittery effect.
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