mineral
Aventurine Quartz
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
Hardness: 6.5-7 (Mohs scale); Color: Green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Notable for its aventurescence effect.
- Hardness
- 6
- Color
- Green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Notable for its aventurescence effect.
Formation & geological history
Formed in metamorphic rocks and magmatic environments where tectonic pressure and heat allow for the growth of quartz with platy mineral inclusions like chromium-rich mica (fuchsite).
Uses & applications
Widely used in jewelry (beads, cabochons), ornamental carvings, figurines, and as a popular lucky stone for mineral collectors.
Geological facts
Aventurine is known for its shimmering effect called 'aventurescence,' caused by light reflecting off tiny inclusions of green mica. The name is derived from the Italian 'a ventura' meaning 'by chance.'
Field identification & locations
Identify by its characteristic green color and internal metallic-looking sparkles. While this specimen was found in the Las Cruces area (New Mexico), it is likely a tumbled stone that was lost or discarded, as significant green aventurine deposits are more typical of Brazil, India, and Russia.
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