Mineral (silicate variety)

Blue Aventurine

Silicon Dioxide (SiO2) with inclusions of Dumortierite

Hardness: 7 on the Mohs scale. Color: Medium to dark blue with a grainy appearance. Luster: Vitreous to waxy. Crystal structure: Hexagonal/Trigonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.63 - 2.65.

Hardness: 7 on the Mohs scale
Color: Medium to dark blue with a grainy appearance
Luster: Vitreous to waxy

Identified March 25, 2026More mineral (silicate variety) →

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Physical properties

Formation & geological history

Formed in metamorphic rocks (quartzite) through the process of regional metamorphism. The blue color and metallic shimmer (aventurescence) are caused by the presence of mineral inclusions, primarily dumortierite, during its crystallization phase.

Uses & applications

Primarily used for ornamental purposes, including beads, cabochons, carved figurines, and decorative home decor. It is also popular in the metaphysical community and lapidary arts.

Geological facts

While green aventurine is the most common, the blue variety is highly prized for its unique quartz-based shimmer. The name 'aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to the accidental discovery of aventurine glass in the 18th century.

Field identification & locations

Identify in the field by its hardness (will scratch glass), grainy texture, and blue color that appears 'inside' the stone rather than just on the surface. Commonly found in Brazil, India, and parts of Russia. Collectors should look for a uniform blue color and visible sparkles known as aventurescence.

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