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Phosphosiderite: Fe+++PO4·2(H2O) Tinsleyite: KAl2(PO4)2(OH)·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
Phosphosiderite: Fe+++PO4·2(H2O) Barbosalite: Fe++Fe+++2(PO4)2(OH)2
Comments: Transparent, brown crystal of phosphosiderite on black barbosalite. Location: Bull Moose mine, Custer, Custer County, South Dakota, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals