metamorphic
Green Aventurine
Silicon dioxide (SiO2) with inclusions of Fuchsite mica
Hardness: 7 (Mohs scale). Color: Medium to forest green. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (Trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: 2.64-2.69. Known for 'aventurescence'—a shimmering effect from mica inclusions.
- Hardness
- 7 (Mohs scale)
- Color
- Medium to forest green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale). Color: Medium to forest green. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (Trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: 2.64-2.69. Known for 'aventurescence'—a shimmering effect from mica inclusions.
Formation & geological history
Formed through the metamorphic recrystallization of quartz-rich sandstone into quartzite. Its green color is specifically caused by platy inclusions of chromium-rich Fuchsite mica during the metamorphic process. Often found in Precambrian terrains.
Uses & applications
Commonly used in jewelry (beads, cabochons, carvings), ornamental stones, landscaping, and highly valued in the metaphysical market as a stone of prosperity.
Geological facts
The name 'Aventurine' is derived from the Italian 'a ventura,' meaning 'by chance,' originally referring to an 18th-century accidental discovery of goldstone glass which this mineral resembles. It is often mistaken for jade by amateur collectors.
Field identification & locations
Identify in the field by its hardness (will scratch glass), green color, and characteristic sparkly glint when rotated under light. Major deposits are found in India (notably Karnataka), Brazil, and Russia. Look for it in areas with historical regional metamorphism.
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