mineral
Dumortierite Quartz
Dumortierite in Quartz (Al6O3(BO3)(SiO4)3)
Hardness of 7 on the Mohs scale, deep blue to violet-blue color, vitreous to dull luster, fibrous crystal habit, specific gravity around 3.26 to 3.34.
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Physical properties
Hardness of 7 on the Mohs scale, deep blue to violet-blue color, vitreous to dull luster, fibrous crystal habit, specific gravity around 3.26 to 3.34.
Formation & geological history
Formed in high-temperature aluminium-rich regional metamorphic rocks, pegmatites, and as an alteration product in boron-rich granites.
Uses & applications
Used for ornamental carvings, cabochons, bead jewelry, and occasionally as a refractory material due to high heat resistance.
Geological facts
Dumortierite is often mistaken for lapis lazuli or sodalite, but its hardness is notably higher and it lacks the pyrite inclusions typical of lapis.
Field identification & locations
Identified by its distinct denim-blue color and hardness capable of scratching glass; commonly found in Brazil, Namibia, Madagascar, and the USA.
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