metamorphic
Aventurine
Quartzite with inclusions (SiO2 containing Fuchsite chrome mica)
Hardness: 6.5-7 (Mohs); Color: Green, teal, or sea-foam; Luster: Vitreous to waxy; Structure: Trigeminal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69
- Hardness
- 6
- Color
- Green, teal, or sea-foam
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Green, teal, or sea-foam; Luster: Vitreous to waxy; Structure: Trigeminal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69
Formation & geological history
Formed through the regional metamorphism of sandstone or shale, where heat and pressure recrystallize quartz and incorporate mica inclusions. Typically found in Precambrian to Paleozoic rock formations.
Uses & applications
Commonly used in jewelry (cabochons, beads), decorative carvings, aquarium gravel, landscaping, and as a popular semi-precious stone for gemstone collectors and metaphysical practitioners.
Geological facts
Aventurine displays a unique optical phenomenon called 'aventurescence,' which is a shimmering effect caused by the presence of platy mineral inclusions (usually fuchsite) that reflect light.
Field identification & locations
Identify by its characteristic 'shimmer' when rotated under light and its green color variations. Commonly found in India, Brazil, and Russia. Collectors should look for consistent translucency and even distribution of chrome mica flakes.
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