mineral
Blue Quartz (Dumortierite Quartz)
Silicon dioxide (SiO2) with inclusions of Dumortierite (Al7BO3(SiO4)3O3)
Hardness: 7 on Mohs scale; Color: Denim blue to grayish-blue; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Denim blue to grayish-blue
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Denim blue to grayish-blue; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
Formation & geological history
Typically forms through hydrothermal processes or in metamorphic rocks where boron-rich fluids interact with quartz. It is often found in pegmatites and regionally metamorphosed rocks.
Uses & applications
Used primarily in jewelry as cabochons or beads, ornamental carvings, and as a popular specimen for gemstone collectors or metaphysical practitioners.
Geological facts
Unlike Blue Chalcedony, Blue Quartz gets its color from microscopic inclusions of other minerals, most commonly needle-like crystals of Dumortierite or Crocidolite. It is much rarer than clear or smoky quartz.
Field identification & locations
Identify in the field by its distinct waxy denim-blue color and hardness (it will scratch glass). Commonly found in Brazil, Madagascar, and parts of the United States like Virginia and California.
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