metamorphic
Green Aventurine
Aventurine Quartz (SiO2 + Cr-bearing Mica inclusions)
Hardness: 6.5-7 (Mohs); Color: Pale to medium green; Luster: Vitreous; Crystal Structure: Trigonal; Fracture: Conchoidal; Specific Gravity: 2.64-2.69. Displays aventurescence effect.
- Hardness
- 6
- Color
- Pale to medium green
- Luster
- Vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Pale to medium green; Luster: Vitreous; Crystal Structure: Trigonal; Fracture: Conchoidal; Specific Gravity: 2.64-2.69. Displays aventurescence effect.
Formation & geological history
Formed as a metamorphic rock (quartzite) containing platy mineral inclusions, typically fuchsite (chrome mica), which give it the distinctive green color and shimmering look.
Uses & applications
Primarily used in jewelry for cabochons, beads, and carvings. Also used as an ornamental stone and for metaphysical collecting.
Geological facts
The name comes from the Italian 'a ventura', meaning 'by chance', originally referring to accidental aventurine glass discovery in the 18th century. It is known as the 'Stone of Opportunity' in folklore.
Field identification & locations
Identify by its characteristic 'aventurescence' (metallic glitters) caused by inclusions. Found in India, Brazil, and Russia. Often confused with jade or emerald, but distinguished by its quartz-like hardness and sparkling flakes.
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