metamorphic
Aventurine (specifically Green Aventurine)
Silicon Dioxide (Quartz) with inclusions of Fuchsite; SiO2 + K(Al,Cr)2AlSi3O10(OH)2
Hardness: 6.5–7 on Mohs scale. Color: Translucent to opaque light green (due to Fuchsite). Luster: Vitreous to waxy. Crystal Structure: Hexagonal (trigonal) microcrystalline. Cleavage: None. Specific gravity: 2.64–2.69.
- Hardness
- 6
- Color
- Translucent to opaque light green (due to Fuchsite)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 on Mohs scale. Color: Translucent to opaque light green (due to Fuchsite). Luster: Vitreous to waxy. Crystal Structure: Hexagonal (trigonal) microcrystalline. Cleavage: None. Specific gravity: 2.64–2.69.
Formation & geological history
Formed in metamorphic rocks (schists and phyllites) via the recrystallization of quartz grains under high heat and pressure, with the inclusion of platy mineral crystals like chromium-rich mica (fuchsite) during the process.
Uses & applications
Predominantly used for jewelry (beads, cabochons), ornamental housewares, landscaping, and metaphysical/collecting purposes.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to an 18th-century accidental discovery of 'aventurine glass' (goldstone) which it resembles due to its shimmering 'aventurescence.'
Field identification & locations
Identify in the field by its distinct green color and 'aventurescence'—a shimmering effect caused by light reflecting off tiny inclusions within the stone. Commonly found in India (major source for bead material), Brazil, and Russia. Collectors should look for even color and a strong shimmer.
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