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Medenbachite: Bi2Fe+++(Cu,Fe+++)(O,OH)2(OH)2(AsO4)2
Comments: SEM image of tabular plates of mendenbachite crystals. (AmMin, v81:505). Location: Silicified barite vein from Reichenbach near Bensheim, Odenwald, Hesse, Germany. Scale: Scale Bar 20 µm. © American Mineralogist