metamorphic
Purple Aventurine
Quartzite with Lepidolite (SiO2 + K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
Hardness: 7 (Mohs scale), Color: Varying shades of purple and lavender, Luster: Vitreous to pearly, Crystal Structure: Hexagonal (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.64-2.69. It often displays aventurescence (a glistening effect).
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Physical properties
Hardness: 7 (Mohs scale), Color: Varying shades of purple and lavender, Luster: Vitreous to pearly, Crystal Structure: Hexagonal (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.64-2.69. It often displays aventurescence (a glistening effect).
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. The distinctive purple color and shimmer are typically caused by inclusions of the mica-mineral Lepidolite during the crystallization process.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, and in the metaphysical/holistic healing community as a meditation stone.
Geological facts
While green is the most common color of aventurine (caused by fuchsite), purple aventurine is a rarer variety. The term aventurescence comes from the Italian 'a ventura,' meaning 'by chance,' referencing the accidental discovery of aventurine glass in the 18th century.
Field identification & locations
Identify in the field by its hardness (cannot be scratched by a steel knife) and its grainy, sugary texture under the surface. It is commonly found in Brazil, India, and Russia. Collectors value specimens with high lepidolite content which produces a better shimmer.
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