Mineral (Variety of Quartz)
Blue Aventurine
Silicon Dioxide (SiO2) with inclusions of Dumortierite
Hardness: 7 (Mohs scale); Color: Cornflower to denim blue; Luster: Vitreous to waxy; Crystal structure: Hexagonal/Trigonal; Cleavage: None; Specific gravity: 2.63–2.69
- Hardness
- 7 (Mohs scale)
- Color
- Cornflower to denim blue
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Cornflower to denim blue; Luster: Vitreous to waxy; Crystal structure: Hexagonal/Trigonal; Cleavage: None; Specific gravity: 2.63–2.69
Formation & geological history
Formed in metamorphic environments where quartz-rich rocks undergo recrystallization. The blue color is typically caused by the presence of silicates like Dumortierite or Crocidolite within the quartz during formation.
Uses & applications
Predominantly used for lapidary work, including figurines (like the elephant shown), cabochons for jewelry, tumbled stones, and as a decorative architectural material.
Geological facts
Aventurine is known for 'aventurescence,' an optical shimmer caused by platy inclusions. Unlike blue lace agate, which is banded, blue aventurine is typically solid or mottled in color.
Field identification & locations
Identify by its matte to vitreous luster and characteristic blue hue that does not rub off (unlike dyed stones). Common locations include Brazil, India, and parts of Russia. Collectors should look for even color distribution and lack of surface-reaching fractures.
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