mineral
Green Aventurine
SiO2 (Silicon Dioxide with inclusions of Fuchsite)
Hardness: 7 Mohs; Color: Mottled green with white specks; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69
- Hardness
- 7 Mohs
- Color
- Mottled green with white specks
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 Mohs; Color: Mottled green with white specks; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69
Formation & geological history
Formed in magmatic and metamorphic environments where quartz crystallizes with mica inclusions. The green color specifically comes from Fuchsite, a chromium-rich mica. Often found in metamorphic rocks like phyllites and schists.
Uses & applications
Used extensively in jewelry for beads and cabochons, ornamental carvings, and as a popular pocket stone or decorative item in the lapidary arts.
Geological facts
Aventurine is known for 'aventurescence,' a shimmering effect caused by platy mineral inclusions. It was named after the Italian 'a ventura' (by chance), originally referring to a type of Italian glass.
Field identification & locations
Identified by its distinctive grainy green color and shimmering inclusions. Commonly found in India, Brazil, and Russia. Collectors look for even color distribution and strong shimmering effects.
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