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Mineralpedia Details for Rockbridgeite

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Rockbridgeite

Rockbridgeite

Named for its type locality in Rockbridge Co., Virginia, USA. Rockbridgeite is a widespread and sometimes locally abundant in localities including several localities in the United States like right here in the Black Hills at the Tip Top, Bull Moose, and Etta mines in South Dakota, Brazil, Argentina, Portugal, France, Germany, Australia, Namibia, Zimbabwe, and Morocco. Rockbridgeite can be found in limonites from iron deposits and also as a product of the alteration of phosphates in granite pegmatites.

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

Formula
Fe2+Fe3+4(PO4)3(OH)5 
Crystal System
Orthorhombic 
Cleavage
Perfect, Distinct, Distinct 
Luster
Vitreous - Dull 
Color
green, dark olive green, black, brownish green, reddish brown 
Streak
greenish gray 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Uneven 
Hardness
4.5 
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Rockbridgeite from Block 14 Opencut, Broken Hill, New South Wales, Australia

Rockbridgeite
            from Block 14 Opencut, Broken Hill, New South Wales, Australia

Tiny acicular crystals of black to dark green Rockbridgeite filling spongy matrix with a host of other grungy arsenates and a bit of micro Adamites.

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

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

Dark green to black Rockbridgeite displaying nice radial and concentric patterns.

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

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

Excellent black acicular crystals in divergent groups to 1mm and acicular crystals in a compact divergent group to 3cm.

Also, dark green to black compact fibrous Rockbridgeite to 3cm with red Hureaulite.

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Rockbridgeite from Foote mine, Cleveland Co., North Carolina, United States

Rockbridgeite
            from Foote mine, Cleveland Co., North Carolina, United States

Black bead-like crystal groups to 1mm on green Mitridatite (?).

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