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Tinsleyite: KAl2(PO4)2(OH)·2(H2O) Phosphosiderite: Fe+++PO4·2(H2O) Rockbridgeite: (Fe++,Mn)Fe+++4(PO4)3(OH)5
Comments: Violet botryoidal tinsleyite on bluish-purple botryoidal phosphosiderite on dark, massive rockbridgeite. Location: Bendada, Guarda, Portugal. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species