metamorphic
Dumetierite in Quartz (Blue Quartz)
Dumortierite (Al7BO3(SiO4)3O3) inclusions in Quartz (SiO2)
AI-generated identification · may be incorrectHardness: 7 (Mohs scale), Color: Indigo blue to violet-blue, Luster: Vitreous to dull (polished), Crystal Structure: Orthorhombic (dumortierite) within Trigonal (quartz), Cleavage: Poor, Specific Gravity: 2.65 - 3.41
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Physical properties
Hardness: 7 (Mohs scale), Color: Indigo blue to violet-blue, Luster: Vitreous to dull (polished), Crystal Structure: Orthorhombic (dumortierite) within Trigonal (quartz), Cleavage: Poor, Specific Gravity: 2.65 - 3.41
Formation & geological history
Formed in aluminum-rich regional metamorphic rocks, as well as in pegmatites. The blue color is provided by fibrous inclusions of the mineral dumortierite within the quartz matrix.
Uses & applications
Predominantly used as a decorative stone, in lapidary work for cabochons and tumbled stones, and as a popular specimen for crystal healing and metaphysical collections.
Geological facts
It is often mistaken for sodalite or lapis lazuli, but its superior hardness (matching quartz) distinguishes it. It was named after the French paleontologist Eugène Dumortier.
Field identification & locations
Identify by its deep denim-blue color and lack of the white calcite or gold pyrite flecks commonly found in Sodalite/Lapis. It is frequently found in Brazil, Madagascar, and Norway.
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