mineral
Green Aventurine
Quartz containing Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
Hardness: 7 (Mohs scale), Color: Pale to dark green with a shimmering effect (aventurescence), Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Specific Gravity: 2.64-2.69
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Physical properties
Hardness: 7 (Mohs scale), Color: Pale to dark green with a shimmering effect (aventurescence), Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Specific Gravity: 2.64-2.69
Formation & geological history
Formed in metamorphic rocks and hydrothermal veins where silica-rich fluids cool and crystallize, trapping tiny flakes of green chrome-mica (fuchsite) during the growth process.
Uses & applications
Largely used for decorative items, jewelry beads, tumbled stones, carvings, and as a popular specimen for crystal collectors.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura', meaning 'by chance', originally referring to the accidental discovery of aventurine glass around 1700.
Field identification & locations
Identify by its characteristic green shimmer when rotated under light. Commonly found in India, Brazil, and Russia. It is often confused with jade but is harder and has internal glints.
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Schist
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Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
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Mineral/Rock