mineral
Dumortierite Quartz
Dumortierite-bearing Quartz (SiO2 with Al7BO3(SiO4)3O3)
AI-generated identification · may be incorrectHardness 7 on Mohs scale, vibrant blue to violet-blue color, vitreous to greasy luster, trigonal crystal system, specific gravity 2.65-3.3.
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Physical properties
Hardness 7 on Mohs scale, vibrant blue to violet-blue color, vitreous to greasy luster, trigonal crystal system, specific gravity 2.65-3.3.
Formation & geological history
Formed in boron-rich aluminum-bearing pegmatites, metamorphic rocks, and hydrothermally altered rocks during ancient geological periods.
Uses & applications
Used primarily in lapidary work, carved ornaments, cabochons for jewelry, and as a collector's mineral specimen.
Geological facts
Often confused with lapis lazuli or sodalite, but distinguished by its hard quartz matrix. It takes a brilliant polish and is mined notably in Namibia and the USA.
Field identification & locations
Identify by its distinctive denim-blue inclusions embedded within a translucent to milky quartz host rock. Common localities include Nevada, USA, and Madagascar.
