metamorphic
Green Aventurine
SiO2 (Silicon Dioxide) with inclusions of Fuchsite
Hardness: 6.5–7 on Mohs scale; Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Specific gravity: 2.64–2.69; Distinctive feature: Aventurescence
- Hardness
- 6
- Color
- Pale to deep green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 on Mohs scale; Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Specific gravity: 2.64–2.69; Distinctive feature: Aventurescence
Formation & geological history
Formed in metamorphic rocks where quartzite is subjected to high heat and pressure, allowing Chromium-rich Fuchsite mica to intergrow within the quartz structure. Most specimens are from the Proterozoic to Paleozoic eras.
Uses & applications
Commonly used for jewelry (pendants, beads), cabochons, ornamental carvings, and 'healing stones' in metaphysical practices.
Geological facts
The name 'Aventurine' comes from the Italian word 'a ventura,' meaning 'by chance.' It was originally applied to a type of Italian glass discovered accidentally that resembled the stone's sparkly appearance.
Field identification & locations
Identified by its characteristic shimmering effect (aventurescence) caused by mica inclusions. Found frequently in India (the primary source), Brazil, and Russia. Collectors should look for even color distribution and strong shimmer.
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