mineral
Dumortierite in Quartz
Silicon Dioxide with Aluminium Borosilicate (SiO2 + (Al,Fe7+)7(BO3)(SiO4)3O3)
Hardness of 7 on the Mohs scale for quartz; color is milky white with a distinct patch of royal blue to indigo; vitreous to greasy luster; crystal system is trigonal (quartz) and orthorhombic (dumortierite); specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale for quartz; color is milky white with a distinct patch of royal blue to indigo; vitreous to greasy luster; crystal system is trigonal (quartz) and orthorhombic (dumortierite); specific gravity around 2.65.
Formation & geological history
Formed in boron-rich pegmatites, metamorphic rocks, and hydrothermally altered aluminum-rich rocks. Geological age varies widely depending on the host rock formation.
Uses & applications
Used primarily as a semi-precious gemstone, in jewelry, for decorative carvings, and as a collector's specimen.
Geological facts
Dumortierite is often mistaken for sodalite, lazulite, or azurite, but its association with quartz and higher hardness distinguishes it.
Field identification & locations
Can be identified by its stark contrast of blue inclusions within a white quartz matrix and its inability to be scratched by steel.
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