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EDX analyses of encrustations on Carbothane. Mapping of the elements shows large crystals of Mg, P, and O, presumably being struvite (appearing orange). The Ca- and P-containing matrix of calcium carbonate apatite (appearing green) was multi-layered and rough in nature. FE-SEM Merlin VP compact (Zeiss) with EDX-detector XFlash 6/30 (Bruker).
