metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Hardness: 7 (Mohs); Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69; Distinctive feature: Aventurescence (metallic glints).
- Hardness
- 7 (Mohs)
- Color
- Pale to deep green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs); Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69; Distinctive feature: Aventurescence (metallic glints).
Formation & geological history
Formed as a translucent variety of quartzite through the regional metamorphism of sandstone. Its green color and sparkling effect come from platelets of chromium-rich mica (fuchsite) trapped within the quartz during formation millions of years ago.
Uses & applications
Commonly used in jewelry (cabochons, beads), decorative bowls, figurines, aquarium stone, and as a popular stone in metaphysical/crystal healing circles.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to a type of Italian glass discovered by accident which resembled this stone. It is often called the 'Stone of Opportunity.'
Field identification & locations
Identify in the field by its green color combined with 'aventurescence' (optical shimmering effect). Commonly found in India, Brazil, Russia, and Tanzania. Look for a quartzite texture with a sugary appearance on fresh surfaces.
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