Abstract
Single crystals of wyllieite-type silver(I) manganese(II) trisorthoarsenate(V), Ag1.09Mn3.46(AsO4)(3), were grown by a solid-state reaction. The three-dimensional framework is made up from four Mn2+Mn3+ cations surrounded octahedrally by O atoms. The MnO6 octahedra are linked through edge-and corner-sharing. Three independent AsO4 tetrahedra are linked to the framework through common corners, delimiting channels along [100] in which two partly occupied Ag+ sites reside, one on an inversion centre and with an occupancy of 0.631 (4), the other on a general site and with an occupancy of 0.774 (3), both within distorted tetrahedral environments. One of the Mn sites is also located on an inversion centre and is partly occupied, with an occupancy of 0.916 (5). Related compounds with alluaudite-type or rosemaryite- type structures are compared and discussed.