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Reddingite: Mn++3(PO4)2·3(H2O)
Comments: Opaque brown crystalline reddingite. Location: Tip Top Quarry, Custer County, South Dakota, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Brown crystals of reddingite on matrix. Location: Boa Vista creek, Minas Gerais, Brazil. Scale: Crystal size 1 mm. © Sandro Maggia/Minernet.it
Comments: Golden brown to brown, highly lustrous, pseudo-octahedral crystals of reddinite. Location: Cigana mine, Galileia, Minas Gerais, Brazil. Scale: Crystal size 0.5 mm. © Tom Loomis / Dakota Matrix