metamorphic
Aventurine
Aventurine Quartz
Hardness: 6.5-7 (Mohs); Color: Pale to dark green with a grainy texture; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Notable platy mineral inclusions causing aventurescence.
- Hardness
- 6
- Color
- Pale to dark green with a grainy texture
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Pale to dark green with a grainy texture; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Notable platy mineral inclusions causing aventurescence.
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite, where mica crystals (fuchsite) grow and align within the quartz matrix to give it a green hue and shimmering effect.
Uses & applications
Widely used for ornamental carvings, beads, cabochons for jewelry, figurines, and as a decorative stone in landscaping or interior design.
Geological facts
The name 'aventurine' comes from the Italian word 'a ventura', meaning 'by chance', originally referring to an accidental 18th-century discovery of Italian glass that looked similar to this mineral.
Field identification & locations
Identify by its distinct green color, granular sugary surface texture, and the presence of tiny reflective sparkles (aventurescence) when turned under light. Found commonly in India, Brazil, and Russia.
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