mineral
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2 + K(Al,Cr)2AlSi3O10(OH)2
Hardness: 6.5 - 7 on the Mohs scale. Color: Pale to deep green with a shimmering effect called aventurescence. Luster: Vitreous to waxy. Crystal structure: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.64 - 2.69.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5 - 7 on the Mohs scale. Color: Pale to deep green with a shimmering effect called aventurescence. Luster: Vitreous to waxy. Crystal structure: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.64 - 2.69.
Formation & geological history
Formed in magmatic deposits, hydrothermal veins, and metamorphic rocks. Most green aventurine forms in metamorphic environments where chromium-rich muscovite mica (fuchsite) is present within the quartz matrix. Most deposits are millions of years old, often found in Precambrian shields.
Uses & applications
Predominantly used for lapidary work including jewelry (beads, cabochons), ornamental carvings (figurines, bowls), and as a popular stone for mineral collectors and metaphysical practitioners.
Geological facts
The name comes from the Italian 'a ventura,' meaning 'by chance,' referencing the serendipitous discovery of aventurine glass in the 18th century before the natural mineral was widely recognized. Its unique shimmer is caused by platy inclusions of mica.
Field identification & locations
Identify in the field by its distinct green color combined with a 'sparkle' inside the stone when moved under light. It is commonly found in India (the largest producer), Brazil, Russia, and Tanzania. Collectors should look for even color distribution and strong aventurescence.
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