mineral
Blue Dumortierite Quartz
Dumortierite Inclusions in Quartz (SiO2 with Al7(BO3)(SiO4)3O3)
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 More mineral →
Explore Blue Dumortierite Quartz in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
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.
More like this
Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock