metamorphic
Rough Green Adventurine
Aventurine (Variety of Quartz, SiO2)
Hardness: 6.5–7 Mohs; Color: Muted green to forest green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Specific Gravity: 2.64–2.69; Features 'aventurescence' due to fuchsite mica inclusions.
- Hardness
- 6
- Color
- Muted green to forest green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 Mohs; Color: Muted green to forest green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Specific Gravity: 2.64–2.69; Features 'aventurescence' due to fuchsite mica inclusions.
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite. During recrystallization, tiny plate-like inclusions of green fuchsite (chromium-rich mica) are trapped within the quartz matrix, creating its signature green shimmer.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and carvings. Also used in ornamental construction, landscaping stones, and as a popular 'healing crystal' in the metaphysical community.
Geological facts
The name comes from the Italian 'a ventura,' meaning 'by chance,' referencing the accidental discovery of goldstone glass in the 18th century, which looks similar to this natural stone.
Field identification & locations
Identify by its grainy, sugary texture and characteristic green color that doesn't look purely transparent. Often found in India, Brazil, and Russia. Unlike Jade, it is harder and shows tiny internal sparkly reflections.
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