metamorphic
Aventurine Quartz
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
Hardness: 6.5-7 (Mohs); Color: Pale green to forest green; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None; Specific gravity: 2.64-2.69; Notable for its 'aventurescence' (shimmering effect).
- Hardness
- 6
- Color
- Pale green to forest green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Pale green to forest green; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None; Specific gravity: 2.64-2.69; Notable for its 'aventurescence' (shimmering effect).
Formation & geological history
Formed in metamorphic environments where quartz sandstone is subjected to heat and pressure. The green color is a result of chromium-rich fuchsite mica inclusions aligning within the quartz matrix. Can also occur in igneous rocks through hydrothermal processes.
Uses & applications
Commonly used for decorative carvings, jewelry (cabochons and beads), landscaping stones, and as a popular specimen for crystal healing and metaphysical collections.
Geological facts
The name 'aventurine' comes from the Italian word 'a ventura', meaning 'by chance', originally referring to accidental discoveries of aventurine-like glass in the 18th century. It is often mistaken for jade due to its color.
Field identification & locations
Identify by its characteristic green color and shimmering mica flakes beneath the surface. It is commonly found in India, Brazil, and Russia. When found in the field, look for a grainy, quartzite-like texture with sparkly greenish surface layers.
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