mineral
Blue Quartz (or Blue Aventurine)
Silicon Dioxide (SiO2) with inclusions (typically Crocidolite or Dumortierite)
Hardness: 7 (Mohs scale); Color: Blue to grayish-blue with white/clear bands; Luster: Vitreous to waxy (when polished); Crystal Structure: Hexagonal (trigonal); Cleavage: None; Specific Gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Blue to grayish-blue with white/clear bands
- Luster
- Vitreous to waxy (when polished)
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Physical properties
Hardness: 7 (Mohs scale); Color: Blue to grayish-blue with white/clear bands; Luster: Vitreous to waxy (when polished); Crystal Structure: Hexagonal (trigonal); Cleavage: None; Specific Gravity: 2.65
Formation & geological history
Quartz forms in various geological environments, but the blue variety specifically gains its color from the inclusion of other minerals within the quartz matrix during crystallization. It is often found in metamorphic or igneous settings.
Uses & applications
Used primarily for ornamental purposes, jewelry (such as beads, cabochons, and tumbled stones), and by collectors or in metaphysical practices.
Geological facts
Unlike many blue minerals whose color comes from chemical elements in the crystal lattice, blue quartz usually gets its color from 'Tyndall scattering' caused by microscopic mineral inclusions.
Field identification & locations
Identify by its hardness (will scratch glass) and lack of distinct cleavage. Often found in South Africa, Brazil, and India. Tumbled stones like this are common in rock shops internationally.
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