Rock Identifier
Blue Quartz (Aventurine) (Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite) — mineral
mineral

Blue Quartz (Aventurine)

Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite

Hardness: 7 on Mohs scale; Color: Light to dark blue; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.63 - 2.69

Hardness
7 on Mohs scale
Color
Light to dark blue
Luster
Vitreous (glassy)
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Physical properties

Hardness: 7 on Mohs scale; Color: Light to dark blue; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.63 - 2.69

Formation & geological history

Formed through the cooling of silica-rich hydrothermal fluids or within metamorphic environments where blue minerals like dumortierite silicate are present and entrapped within the quartz crystals during growth.

Uses & applications

Primarily used for decorative purposes, lapidary work (cabochons, beads), metaphysical healing practices, and as a collector specimen.

Geological facts

The blue color in quartz is usually not caused by chemical impurities within the crystal lattice itself, but by the Rayleigh scattering of light off microscopic inclusions of other blue minerals.

Field identification & locations

Identify by its hardness (will scratch glass), lack of cleavage, and the grainy, 'aventurescent' look caused by internal inclusions. Commonly found in Brazil, India, and parts of Africa.

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