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Jahnsite-(MnMnMn): MnMnMn2Fe+++2(PO4)4(OH)2·8(H2O)
Comments: Brownish red aggregate of jahnsite-(MnMnMn). Location: Stewart Mine, Near Pala, San Diego Co., California, USA. Scale: Specimen Size 8x5x4 mm. © Sergey Vasiliev / Systematic Mineralogy