mineral
Aventurine
Silicon Dioxide (SiO2) with inclusions
Hardness: 6.5-7 (Mohs scale), Color: Pale to deep green, Luster: Vitreous to waxy, Crystal structure: Hexagonal (trigonal), Cleavage: None, Specific gravity: 2.64-2.69
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Pale to deep green, Luster: Vitreous to waxy, Crystal structure: Hexagonal (trigonal), Cleavage: None, Specific gravity: 2.64-2.69
Formation & geological history
Formed in metamorphic rocks and igneous veins when molten silica or quartz recrystallizes with trapped mineral inclusions, typically fuchsite mica which gives the green color.
Uses & applications
Used primarily in lapidary work for jewelry, figurines, cabochons, and ornamental carvings; also popular in metaphysical collections.
Geological facts
The name comes from Italian 'a ventura', meaning 'by chance', originally referring to accidental production of goldstone glass. Natural aventurine is known for 'aventurescence', a shimmering effect caused by platy mineral inclusions.
Field identification & locations
Identify by its characteristic green color and shimmering mica flecks when turned under light. Commonly found in India, Brazil, and Russia. Used as a lower-cost alternative to jade.
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