Citation: Keller, P.; Hatert, F.; Lissner, F.; Schleid, T.; Fransolet, A. M. (2006). Hydrothermal synthesis and crystal structure of Na(NaMn)7Mn22(PO4)18*0.5H2O, a new compund of fillowite structure type. European Journal of Mineralogy, 18, pp. 765-774.