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Mineralpedia Details for Hureaulite

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Hureaulite

Hureaulite

Named after the type locality of the mineral at Les Hureaux in Saint-Sylvestre, Limousin, France. Hureaulite is an uncommon mineral that can be found in additional localities in France, Portugal, Germany, Sweden, Finland, the United States including here in South Dakota in the Tip Top, Bull Moose, and White Elephant mines among many others in the Black Hills, Brazil, Rwanda, and Pakistan, among others. It is a secondary mineral that forms late-stage in granite pegmatites by the alteration of primary phosphates.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/hureaulite.pdf

Formula
Mn2+5(PO4)2(PO3OH)2ยท4H2
Crystal System
Monoclinic 
Crystal Habit
Massive, Compact, Fibrous 
Cleavage
Distinct, None, None 
Luster
Vitreous - Greasy 
Color
red, white, grayish white, yellowish white, reddish white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Uneven 
Hardness
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Mindat
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Hureaulite from Tip Top mine, Custer Co., South Dakota, United States

Hureaulite
            from Tip Top mine, Custer Co., South Dakota, United States

Light pink or salmon colored crystals to 1.5cm associated with bright green Tavorite and/or glassy brown Jahnsite (CaMnMg) and light purple to grey Leucophosphite.

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Hureaulite from Mangualde, Viseu dist., Portugal

Hureaulite
            from Mangualde, Viseu dist., Portugal

Pink crystals aggregates to 3mm covering most of matrix associated with black Rockbridgeite.

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Hureaulite from Galiléia, Doce valley, Minas Gerais, Brazil

Hureaulite
            from Galiléia, Doce valley, Minas Gerais, Brazil

Cluster of beautiful pink Hureaulite crystals to 1cm. Overall 6cm specimen.

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Hureaulite from Sao Jose da Safira, Doce valley, Minas Gerais, Brazil

Hureaulite
            from Sao Jose da Safira, Doce valley, Minas Gerais, Brazil

Superb, fine mineral specimen with pinkish red, translucent crystals of Hureaulite to 8mm in divergent groups and showing excellent terminations. It is associated with 0.5mm crystals of equant, shiny black Barbosalite crystals, which also comprises the matrix.

This specimen was featured as an entry in the Barlow book on page 142 (specimen 2557) and comes with the tag.

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Hureaulite from Jocão pegmatite, Conselheiro Pena, Doce valley, Minas Gerais, Brazil

Hureaulite
            from Jocão pegmatite, Conselheiro Pena, Doce valley, Minas Gerais, Brazil

Exceptional pink, large crystals to 9mm with most being good, well-defined crystals to about 6-7mm. Near the center is the black, botryoidal Rockbridgeite, a typical association.

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Hureaulite from Hagendorf-Süd, Oberpfälzer Wald, Bavaria, Germany

Hureaulite
            from Hagendorf-Süd, Oberpfälzer Wald, Bavaria, Germany

Dark pinkish red crystals to 1cm in a cluster. Exceptional specimen from this locality.

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