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The crystal structure of manganilvaite, CaFe2+Fe3+(Mn2+,Fe2+)(Si2O7)O(OH), from the Ossikovo Pb-Zn skarn deposit, Rhodope Mountains, Bulgaria, was refi ned in space group P21/a, with a 13.0250(7), b 8.8514(5), c 5.8486(3) Å,  90.167(1)°, V 674.28(7) Å3, Z = 4, using combined neutron and X-ray powder diffraction as well as single-crystal X-ray-diffraction data. The empirical chemical formula proposed on the basis of the Rietveld refi nements is: (Ca0.9Mn2+0.1)(Fe2+0.83Fe3+0.17)(Fe2+0.17 Fe3+0.83)(Mn2+0.51Fe2+0.49)(Si2O7)O(OH). The occupancy of the M11 site (0.83Fe2+ + 0.17Fe3+) corresponds to an order parameter Q of 0.65(10). The high Mn content leads to strong enhancement (14%) of Fe2+ → Fe3+ charge transfer in comparison to Mn-free

STRUCTURE AND CATION ORDER IN MANGANILVAITE: A COMBINED X-RAY-DIFFRACTION, NEUTRON-DIFFRACTION AND MOSSBAUER STUDY