metamorphic
Green Aventurine
Fuchsite-bearing Quartzite (SiO2 with K(Al,Cr)2AlSi3O10(OH)2 inclusions)
Hardness: 6.5-7 (Mohs scale); Color: Pale to medium green with a sparkly sheen; Luster: Vitreous to waxy; Crystal structure: Trigonal (granular aggregate); Cleavage: None; Specific Gravity: 2.64-2.69
- Hardness
- 6
- Color
- Pale to medium green with a sparkly sheen
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Pale to medium green with a sparkly sheen; Luster: Vitreous to waxy; Crystal structure: Trigonal (granular aggregate); Cleavage: None; Specific Gravity: 2.64-2.69
Formation & geological history
Formed primarily through the regional metamorphism of quartz-rich sedimentary rocks (sandstone) where the presence of chromium-rich mica (fuchsite) provides the green color and platy inclusions.
Uses & applications
Extensively used for lapidary work including cabochons, beads, figurines, tumbled stones, and occasionally as an ornamental building stone or in landscaping.
Geological facts
The sparkly metallic luster seen in this specimen is known as aventurescence, caused by light reflecting off tiny platy inclusions of mica within the quartz matrix.
Field identification & locations
Identified by its grainy quartz texture and green internal 'shimmer'. It is commonly found in India, Brazil, Russia, and Austria. Collectors should look for the characteristic mica sparkles that distinguish it from jade or green chalcedony.
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