mineral
Blue Quartz (Dumortierite Quartz)
Silicon Dioxide (SiO2) with Dumortierite inclusions (Al7BO3(SiO4)3O3)
Hardness: 7 (Mohs scale), Color: Sky blue to denim blue, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (Trigonal), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Sky blue to denim blue, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (Trigonal), Specific Gravity: 2.65
Formation & geological history
Formed in silica-rich environments where dumortierite inclusions crystallize within quartz during the cooling of igneous or metamorphic rocks; commonly found in pegmatites.
Uses & applications
Used primarily as a decorative stone, in jewelry (beads, cabochons), and as a collector's specimen for its aesthetic blue hue.
Geological facts
Unlike Sapphire or Lapis Lazuli, the blue color in this quartz is caused by tiny fibrous inclusions of another mineral, dumortierite, rather than chemical impurities within the crystal lattice.
Field identification & locations
Identify by its characteristic blue color that doesn't rub off (unlike dyed stones) and its ability to scratch glass. Commonly found in Brazil, South Africa, and the USA.
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