mineral

Blue Aventurine

Silicon Dioxide (SiO2) containing Dumortierite or Crocidolite inclusions

Hardness: 7 (Mohs scale); Color: Pale to deep denim blue; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.64-2.69. It often exhibits 'aventurescence' (a metallic shimmer).

Hardness: 7 (Mohs scale)
Color: Pale to deep denim blue
Luster: Vitreous to waxy

Identified March 22, 2026More mineral →

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Physical properties

Formation & geological history

Formed in magmatic and metamorphic environments where quartz crystallizes with mineral inclusions. Most specimens are from the Phanerozoic eon, occurring in pegmatites and metamorphic schists.

Uses & applications

Primary use is in the jewelry industry for beads, cabochons, and tumbled stones. Also used for ornamental carvings, spiritual/metaphysical collecting, and as a decorative stone in mosaics.

Geological facts

The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to the accidental discovery of aventurine glass (goldstone) in the 18th century, which this natural stone resembles.

Field identification & locations

Identify by its characteristic blue-grey hue and subtle interior sparkle (aventurescence). Commonly found in Brazil, India, and Russia. In the field, look for grainy quartz-like texture with a blue tint that does not scratch easily with steel.

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