mineral

Blue Quartz (Aventurine)

Silicon Dioxide (SiO2) with inclusions of crocidolite or dumortierite

Hardness: 7 (Mohs scale); Color: Grayish-blue to deep denim blue; Luster: Vitreous (glassy) to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 (Mohs scale)
Color: Grayish-blue to deep denim blue
Luster: Vitreous (glassy) to waxy

Identified March 20, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous or metamorphic environments when macroscopic Quartz crystals incorporate fibrous inclusions during growth; commonly found in Precambrian rock formations.

Uses & applications

Used primarily for ornamental carvings, tumbled stones, jewelry (beads and cabochons), and in metaphysical practices as a 'calming stone'.

Geological facts

The distinctive blue color is not typically caused by a chemical element but by the inclusion of other minerals like Dumortierite; it often exhibits 'aventurescence'—a shimmering effect visible upon rotation.

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of cleavage, and consistent blue-gray hue. Commonly found in Brazil, India, and parts of Russia.

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