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Mineralpedia Details for Beraunite

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Beraunite

Beraunite

Named for the type locality at Beraun, which is now called Beroun in Bohemia in the Czech Republic. Beraunite is an uncommon mineral that can be found as well studied material in the Czech Republic, Germany, England, Portugal ,Sweden, Australia, and the United States including here in the Black Hills of South Dakota at the Tip Top, White Elephant, Big Chief, Hesnard, Barker-Ferguson, and White Cap mines, among several other known localities. Beraunite occurs as a component in bog iron ore, as a cement in clay, sand, and bone material, and as an alteration product of triphylite in granite pegmatites. Tabular, elogated, dull green to breenish brown crystals found in radial fibrous coarse aggregates, globular to discoudal masses, and crusts.

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

Formula
Fe2+Fe3+5(PO4)4(OH)5ยท6H2
Crystal System
Monoclinic 
Crystal Habit
Druse, Radial, Globular 
Cleavage
Good, None, None 
Luster
Vitreous - Dull 
Color
green, greenish brown, gray green, dark greenish brown, dark red 
Streak
green brown 
Class
Monoclinic - Prismatic 
Hardness
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Beraunite from White Cap mine, Pennington Co., South Dakota, United States

Beraunite
            from White Cap mine, Pennington Co., South Dakota, United States

Radial, fibrous dull grey-green Beraunite crystals less than 1mm in a small vug around 1cm across.

Click thumbnail images for larger view.

Beraunite from Rotlaufchen mine, Waldgirmes, Hesse, Germany

Beraunite
            from Rotlaufchen mine, Waldgirmes, Hesse, Germany

Dark red platy crystals of Beraunite variety Oxiberaunite in flat lying radail clusters to 1cm with divergent crystal clusters of bladed colorless Strengite.

The variety Oxiberaunite may be a separate mineral, although it has not been validated, and how one would visually distinguish it from regular Beraunite is hard to tell.

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Beraunite from Gravel Hill mine, Perranzabuloe, Cornwall, England

Beraunite
            from Gravel Hill mine, Perranzabuloe, Cornwall, England

Vuggy specimen with areas filled with dark green, acicular crystals less than 0.5mm.

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Beraunite from Three Oaks Gap, Polk Co., Arkansas, United States

Beraunite
            from Three Oaks Gap, Polk Co., Arkansas, United States

Deep red bladed crystals of Beraunite lining a cavity with minor Kidwellite. The backside has orange, fibrous minute Cacoxenite.

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Beraunite from Leveäniemi Iron mine, Svappavaara, Lappland, Sweden

Beraunite
            from Leveäniemi Iron mine, Svappavaara, Lappland, Sweden

Purple crystal groups of Strengite 2-3mm across on Hematite with light green coatings of Kidwellite and reddish brown Beraunite.

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