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Biphosphammite: (NH4,K)H2PO4
Comments: Vuggy, dark green-brown biphosphammite. Location: Mason Bat Cave, Mason County, Texas, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Biphosphammite: (NH4,K)H2PO4 Archerite: (K,NH4)H2PO4
Comments: Buff-colored biphosphammite with white archerite crusts. Location: Cockelbiddy Cave, Western Australia, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species