metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Hardness: 6.5-7 (Mohs scale); Color: green (due to Fuchsite inclusions); Luster: vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: none; Specific Gravity: 2.64-2.69; Feature: Aventurescence (a shimmering effect).
- Hardness
- 6
- Color
- green (due to Fuchsite inclusions)
- Luster
- vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: green (due to Fuchsite inclusions); Luster: vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: none; Specific Gravity: 2.64-2.69; Feature: Aventurescence (a shimmering effect).
Formation & geological history
Formed as a metamorphic rock (quartzite) where quartz-rich sandstone is subjected to heat and pressure, allowing mica or chlorite crystals to align and create its characteristic shimmer. Most deposits are millions of years old.
Uses & applications
Commonly used for lapidary work, jewelry (beads, cabochons), tumbled stones for collecting, and ornamental carvings. It is also highly popular in metaphysical practices.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura', meaning 'by chance', originally referring to the accidental discovery of aventurine glass (goldstone) in the 18th century, which this natural stone resembles.
Field identification & locations
Identified by its grainy 'quartzite' texture and the subtle metallic sparkles visible under light. Commonly found in India (the primary source), Brazil, and Russia. Collectors should look for even color and a strong aventurescence effect.
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