metamorphic
Green Aventurine
Silicon dioxide (SiO2) with Fuchsite inclusions
Hardness: 7 Mohs; Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69. Known for aventurescence (metallic glint).
- 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: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69. Known for aventurescence (metallic glint).
Formation & geological history
Formed as a metamorphic rock (quartzite) through the heat and pressure of burial, with the green color coming from chromium-rich mica (fuchsite) platey inclusions dispersed within the quartz matrix.
Uses & applications
Widely used in jewelry (beads, cabochons), ornamental carvings, figurines, and as a popular 'healing crystal' in the metaphysical community. Occasionally used in landscaping.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura', meaning 'by chance', originally referring to accidental discovery of aventurine glass in the 18th century which looked similar to this natural stone.
Field identification & locations
Identify by its characteristic green color and shimmering 'aventurescence' under bright light. It is commonly found in India (the largest producer), Brazil, and Russia. Look for granular texture compared to solid jade.
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