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Struvite: (NH4)MgPO4·6(H2O)
Comments: Opaque, white crystal struvite aggregates in earthy matrix. Location: Skipton Caves, Victoria, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Yellow-brown tabular struvite crystal. Struvite is of organogenic origin and this type locality example is formed in manure pits. Location: Nicolaikirche, Hamburg, Germany. Scale: Specimen Size 1 x 1 x 1 cm. © Tom Loomis / Dakota Matrix