metamorphic
Green Aventurine (Green Quartzite)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (chromium-rich mica)
Hardness: 7 (Mohs scale); Color: Sage green to forest green with slight translucency; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69
- Hardness
- 7 (Mohs scale)
- Color
- Sage green to forest green with slight translucency
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Sage green to forest green with slight translucency; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite. The characteristic green color is produced by the presence of tiny platy crystals of fuchsite mica that align during the metamorphic process. Age varies by deposit, typically ranging from Proterozoic to more recent era.
Uses & applications
Commonly used for lapidary work including tumbled stones, beads, cabochons, and ornamental carvings. Also popular in the metaphysical community (referred to as the 'Stone of Opportunity').
Geological facts
Aventurine displays a unique shimmering effect known as 'aventurescence,' caused by light reflecting off the mineral inclusions within the quartz. The name comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to the accidental discovery of aventurine glass in the 18th century.
Field identification & locations
Identify in the field by its hardness (will scratch glass), green color, and the subtle mica sparkles when rotated under direct light. Most commonly found in India (where the majority of green material is mined), Brazil, and Russia. Collectors look for uniform color and strong shimmering effects.
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