mineral
Aventurine
Silicon dioxide (Quartz) with inclusions (KAl2(AlSi3O10)(OH)2)
Hardness: 6.5-7 (Mohs); Color: Green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (often massive); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69
- Hardness
- 6
- Color
- Green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (often massive); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69
Formation & geological history
Forms in metamorphic rocks like phyllites or schists and in hydrothermal veins. The color comes from inclusions of green fuchsite mica within the quartz.
Uses & applications
Commonly used for tumbled stones, cabochons, carvings, ornamental jewelry, and decorative objects.
Geological facts
The name comes from the Italian 'a ventura', meaning 'by chance', originally referring to the accidental discovery of goldstone glass that looks similar.
Field identification & locations
Identify by its 'aventurescence' (a shimmering effect caused by mica inclusions). Found frequently in India, Brazil, and Russia. Often mistaken for jade or emerald.
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Schist
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Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
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Gypsum (variety Selenite or Alabaster)
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Mineral
Nephrite Jade
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Mineral/Rock