metamorphic
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 with K(Al,Cr)2AlSi3O10(OH)2)
Hardness: 7 (Mohs scale), Color: Shimmering green, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (trigonal) microcrystalline, Cleavage: None, Aventurescence: Platy inclusions of fuchsite mica create a shimmering effect.
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Physical properties
Hardness: 7 (Mohs scale), Color: Shimmering green, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (trigonal) microcrystalline, Cleavage: None, Aventurescence: Platy inclusions of fuchsite mica create a shimmering effect.
Formation & geological history
Formed primarily in metamorphic environments where quartz-rich sedimentary rocks (sandstone) undergo intense heat and pressure, integrating mica inclusions during recrystallization. Millions of years old.
Uses & applications
Widely used for ornamental carvings, pocket stones, decorative bowls, and in jewelry as beads or cabochons. Historically used as a gemstone for luck and prosperity.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura', meaning 'by chance', referring to the accidental discovery of aventurine glass. The natural mineral often displays a unique optical effect known as aventurescence.
Field identification & locations
Identify by its characteristic grainy quartz texture and green shimmery sparkle (platy mica). Commonly found in India, Brazil, Russia, and Tanzania. A popular stone for beginner collectors.
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