The dumortierite forms in aluminum rich metamorphic rocks.
The dumortierite gemstone is excessively rare.
To know more about the mineralogy of Dumortierite, see Mindat.org->
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Dumortierite
- Translations : Dumortieriet, Dumortieryt, Dumortierit, Dumortierita, Дюмортьерит
- Etymology : Dedicated to the French paleontologist Eugène Dumortier (1803 - 1873).
- Discovery: 1881
- Type localityChanapost (Rhône Alpes) in France.
Gemological data
- Chemical formula : (Al,Fe3+)7(SiO4)3(BO3)O3
- Hardness (Mohs) : 7 - 8.5
- Density : 3.3 - 4
- Refractive index : ná = 1.659 - 1.678 nâ = 1.684 - 1.691 nã = 1.686 - 1.692
- Birefingence : 0.027
- Crystal system : Orthorhombic
- Group : Dumortierite
- Mineralogical Class : Nesosilcates
The gallery
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- Dumortierite
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