mineral
Green Aventurine
Quartz (Silicon Dioxide) with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 7 (Mohs scale), Color: Dull to waxy green, Luster: Vitreous to waxy, Crystal structure: Hexagonal (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.64-2.69
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Physical properties
Hardness: 7 (Mohs scale), Color: Dull to waxy green, Luster: Vitreous to waxy, Crystal structure: Hexagonal (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.64-2.69
Formation & geological history
Formed in metamorphic rocks (schists) or igneous environments where silica-rich fluids cool and crystallize, capturing flakes of chrome-rich mica (fuchsite) during the process. Usually found in Precambrian to Cenozoic formations.
Uses & applications
Widely used for ornamental carvings, cabochons for jewelry, landscaping, interior design as tiles or countertops, and as a popular stone for mineral collectors and crystal healing.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura', meaning 'by chance', originally referring to accidental glass production in Murano that resembled this natural stone's platy inclusions. Its green color is specifically caused by chromium-rich fuchsite.
Field identification & locations
Identified by its 'aventurescence' (a shimmering or glistening effect caused by light reflecting off internal mica flakes) and its inability to be scratched by steel. Common in India, Brazil, Russia, and Tanzania. Use a scratch test and look for the characteristic granular, mica-filled texture.
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