Mineralpedia Details for Dumortierite
Dumortierite
Named to honor French paleontologist from Lyons, Eugene Dumortier. Dumortierite is somewhat uncommon, but has many localities including in France, Poland, the Czech Republic, the United States, Canada, Namibia, Madagascar, India, and additional minor localities. It occurs in aluminum-rich metamorphic rocks as disseminations and in veinlets cutting through schists, and in pegmatitic veins. Minerals associated with dumotierite include quartz, cordierite, kyanite, andalusite, sillimanite, muscovite, and rutile.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/dumortierite.pdf
- Formula
- (Al,[ ])Al6BSi3O16(O,OH)2
- Crystal System
- Orthorhombic
- Crystal Habit
- Columnar, Fibrous, Prismatic
- Cleavage
- Good, Indistinct, None
- Luster
- Vitreous (Glassy)
- Color
- blue, brown, violet, greenish blue, pink
- Streak
- white
- Class
- Orthorhombic - Dipyramidal
- Fracture
- Fibrous
- Hardness
- 8.5
- WebMineral
- View Dumortierite
- Mindat
- View Dumortierite
Dumortierite from Quartzite, Arizona, United States
Purple matrix with pockets of fine acicular crystals to 1mm.
Dumortierite from Dehesa, San Diego Co., California, United States
Light purple radiating crystal groups to 2cm.
Dumortierite from Canta dist., Canta prov., Lima dept., Peru
Blue mass. Dumortierite is usually pink or red.
