The title compound, LiMn(H2O)(2)[BP2O8]center dot H2O, is built up of an open framework of helical borophosphate ribbons interconnected by MnO4(H2O)(2) octahedra, forming one-dimensional channels along [001] occupied by Li+ cations and disordered H2O molecules (site occupancy 0.5). The Li cations reside in two partially occupied sites [occupancies = 0.42 (3) and 0.289 (13)] near the helices
