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Rittmannite: Mn++Mn++Fe++Al2(OH)2(PO4)4·8(H2O)
Comments: SEM image of rittmannite crystals on massive adularia. (CanMin, v27:447). Location: Found in altered phosphatic "nodules" from the Mangualde granitic pegmatite, Portugal. Scale: 240 X. © Canadian Mineralogist
Comments: Light yellow, opaque, microcrystalline rittmannite on matrix. Location: El Galineiro, Vigo, Pontevedra, Spain. Scale: Specimen Size 2.4 x 2.1 x 1.1 cm. © John Veevaert