mineral

Dumortierite in Quartz

Dumortierite (Al6O3(BO3)(SiO4)3) with Quartz (SiO2)

Hardness: 7 on the Mohs scale for quartz (dumortierite is 7 to 8). Color: Vibrant blue to violet-blue with white/gray quartz matrix. Luster: Vitreous to dull. Crystal structure: Orthorhombic (dumortierite) and trigonal (quartz). Cleavage: Distinct in one direction for dumortierite, none for quartz.

Hardness: 7 on the Mohs scale for quartz (dumortierite is 7 to 8)
Color: Vibrant blue to violet-blue with white/gray quartz matrix
Luster: Vitreous to dull

Identified August 4, 2026More mineral →

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Physical properties

Formation & geological history

Formed in aluminum-rich regional metamorphic rocks, pegmatites, and contact metamorphic zones through hydrothermal alteration.

Uses & applications

Used for lapidary work, carved ornaments, cabochons, metaphysical practices, and as a collector's mineral specimen.

Geological facts

Dumortierite is often mistaken for sodalite, lazurite, or blue quartz. When heated to high temperatures, it turns white, which historically made it useful for manufacturing high-grade porcelain.

Field identification & locations

Found worldwide including in France, Namibia, Madagascar, Brazil, and the United States (such as California and Nevada). Identified by its distinct blue fibrous inclusions within a quartz matrix.

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Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

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