metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
Hardness: 7 Mohs, Color: Green (due to Fuchsite), Luster: Vitreous to waxy, Crystal Structure: Trigonal, Cleavage: None, Specific Gravity: 2.64-2.69
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Physical properties
Hardness: 7 Mohs, Color: Green (due to Fuchsite), Luster: Vitreous to waxy, Crystal Structure: Trigonal, Cleavage: None, Specific Gravity: 2.64-2.69
Formation & geological history
Formed through the regional metamorphism of quartz-rich sedimentary rocks (sandstone) into quartzite, where mica inclusions create the characteristic green shimmer known as aventurescence.
Uses & applications
Used primarily in jewelry, ornamental carvings, decorative stones, and as a popular palm stone or 'worry stone' in the metaphysical community.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to the accidental discovery of goldstone glass in the 18th century, which looks similar.
Field identification & locations
Identify by its 'aventurescence' (a metallic glitter caused by flat mica crystals). Found commonly in India, Brazil, and Russia. It is harder than glass and lacks the internal grain structure of dyed chalcedony.
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