metamorphic
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 7 (Mohs scale), Color: Forest green to pale green, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.64-2.69. It displays 'aventurescence'—a shimmering effect from inclusions.
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Physical properties
Hardness: 7 (Mohs scale), Color: Forest green to pale green, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.64-2.69. It displays 'aventurescence'—a shimmering effect from inclusions.
Formation & geological history
Formed as a metamorphic rock (quartzite) through the heat and pressure of burial, during which platy mineral inclusions like chromium-rich fuchsite mica align to create a glittering green color. Often found in Precambrian terrains.
Uses & applications
Used widely in lapidary work for cabochons, beads, and carvings. Also used in ornamental construction, landscaping, and as a popular 'healing 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 (Italian glass) which looks remarkably similar to this natural stone.
Field identification & locations
Identify in the field by its grainy, sugary texture and the characteristic metallic-looking green sparkles when rotated under light. Common locations include India (the primary source), Brazil, and Russia.
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