metamorphic
Blue Aventurine
Quartzite with inclusions of Dumortierite (SiO2 + Al7(BO3)(SiO4)3O3)
Hardness: 7 Mohs; Color: Pale blue to denim blue with shimmering mica-like spots; Luster: Vitreous to waxy; Crystal structure: Trigonal (granular mass); Specific Gravity: 2.64-2.69
- Hardness
- 7 Mohs
- Color
- Pale blue to denim blue with shimmering mica-like spots
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 Mohs; Color: Pale blue to denim blue with shimmering mica-like spots; Luster: Vitreous to waxy; Crystal structure: Trigonal (granular mass); Specific Gravity: 2.64-2.69
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. The blue color is typically caused by inclusions of the mineral dumortierite during the crystallization process.
Uses & applications
Used primarily in jewelry making for beads and cabochons, as well as for decorative carvings, palm stones, and metaphysical purposes.
Geological facts
Aventurine is known for 'aventurescence,' an optical effect caused by plate-like mineral inclusions that reflect light like tiny mirrors within the stone.
Field identification & locations
Identified by its signature grainy/quartzite texture and the presence of tiny internal sparkles. It is commonly found in Brazil, India, and parts of Russia. Collectors should look for even color distribution.
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