metamorphic
Aventurine
Silicon dioxide with micas (SiO2 + K(Al,Cr)2AlSi3O(OH)2)
Hardness: 6.5-7.0 (Mohs scale); Color: Green; Luster: Vitreous to waxy; Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69; Note: Exhibits aventurescence (shimmer).
- Hardness
- 6
- Color
- Green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7.0 (Mohs scale); Color: Green; Luster: Vitreous to waxy; Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69; Note: Exhibits aventurescence (shimmer).
Formation & geological history
Formed in metamorphic environments where quartz sandstone is subjected to heat and pressure, recrystallizing into quartzite while incorporating mica inclusions like fuchsite during the process.
Uses & applications
Used primarily for jewelry (beads, cabochons), carvings, figurines, ornamental home decor, and historically in early 18th-century glass making imitations.
Geological facts
Green aventurine is often called the 'Stone of Opportunity.' Its signature shimmering effect, called aventurescence, is caused by tiny platelike inclusions of green chrome-mica (fuchsite).
Field identification & locations
Identify by its grainy texture (common to quartzite) and its characteristic internal shimmer. Found frequently in India, Brazil, and Russia. Look for a green color that appears slightly translucent but contains internal sparkling specks.
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