mineral

Blue Dumortierite Quartz

Dumortierite Inclusions in Quartz (SiO2 with Al7(BO3)(SiO4)3O3)

AI-generated identification · may be incorrect

Hardness: 7 (Quartz) to 8 (Mineral); Color: Deep blue to violet-blue; Luster: Vitreous to waxy; Crystal Structure: Orthorhombic (Dumortierite); Specific Gravity: 3.26-3.41

Hardness: 7 (Quartz) to 8 (Mineral)
Color: Deep blue to violet-blue
Luster: Vitreous to waxy

Identified June 29, 2026More mineral →

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Physical properties

Hardness: 7 (Quartz) to 8 (Mineral); Color: Deep blue to violet-blue; Luster: Vitreous to waxy; Crystal Structure: Orthorhombic (Dumortierite); Specific Gravity: 3.26-3.41

Formation & geological history

Formed in boron-rich metamorphic rocks, high-grade regional metamorphic rocks, or pegmatites. The blue color comes from the fibrous inclusions of the mineral dumortierite within the host quartz.

Uses & applications

Used primarily in lapidary work, jewelry (beads, cabochons), and as a collector's gemstone. Also used in the production of high-grade ceramics and porcelain due to its resilience to high temperatures.

Geological facts

Dumortierite is named after the French paleontologist Eugène Dumortier. It is often mistaken for sodalite or lapis lazuli, but it is much harder and more durable for jewelry wear.

Field identification & locations

Identify by its distinct fibrous structure under magnification and its inability to be scratched by a steel file. Commonly found in Madagascar, Brazil, and Mohave County, Arizona. Highly sought after by 'healing stone' enthusiasts.