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Geigerite: Mn5(AsO3OH)2(AsO4)2·10(H2O)
Comments: Small, brownish grains of transparent geigerite (see lower image) in a silicous breccia. Location: Mt. Nero Mine, Borghetto di Vara, La Spieza, Italy. Scale: 3.5 x 1.5 cm. © Rich Geiger