mineral
Dumortierite Quartz
Dumortierite in Quartz (Al6O3(BO3)(SiO4)3)
AI-generated identification · may be incorrectHardness 7 on Mohs scale, blue to violet-blue color, vitreous to greasy luster, trigonal crystal system.
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Physical properties
Hardness 7 on Mohs scale, blue to violet-blue color, vitreous to greasy luster, trigonal crystal system.
Formation & geological history
Formed via high-temperature boron-rich metasomatism in metamorphic and pegmatitic environments.
Uses & applications
Used for lapidary work, cabochons, carved ornamental objects, and crystal specimen collecting.
Geological facts
Dumortierite often forms fibrous aggregates enclosed within quartz, creating a rich denim-blue appearance that is frequently mistaken for lapis lazuli or sodalite.
Field identification & locations
Identify by its distinct blue inclusions within a quartz matrix and its resistance to scratching glass; commonly found in Brazil, Namibia, and the USA.
