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Mineralpedia Details for Dumortierite

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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 
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Dumortierite from Quartzite, Arizona, United States

Dumortierite
            from Quartzite, Arizona, United States

Purple matrix with pockets of fine acicular crystals to 1mm.

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Dumortierite from Dehesa, San Diego Co., California, United States

Dumortierite
            from Dehesa, San Diego Co., California, United States

Light purple radiating crystal groups to 2cm.

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Dumortierite from Canta dist., Canta prov., Lima dept., Peru

Dumortierite
            from Canta dist., Canta prov., Lima dept., Peru

Blue mass. Dumortierite is usually pink or red.

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