metamorphic
Aventurine Quartz
Silicon Dioxide (SiO2) with inclusions (typically Fuchsite mica)
Hardness: 7 Mohs scale; Color: Pale green to forest green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69.
- Hardness
- 7 Mohs scale
- Color
- Pale green to forest green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 Mohs scale; Color: Pale green to forest green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69.
Formation & geological history
Formed through the regional metamorphism of quartz-rich sedimentary rocks (sandstones). The green color and 'aventurescence' (shimmer) are caused by the presence of platy mineral inclusions like green fuchsite mica trapped during crystallization.
Uses & applications
Used primarily in lapidary work for cabochons, beads, ornamental carvings, and 'healing crystal' collections. Also used occasionally in decorative landscaping.
Geological facts
The name comes from the Italian 'a ventura', meaning 'by chance', originally referring to the accidental discovery of goldstone glass in the 18th century, which aventurine resembles.
Field identification & locations
Identify by its characteristic green color and granular texture. Look for the 'aventurescence' shimmering effect when tilted under light. Commonly found in India, Brazil, Russia, and Tanzania.
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