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The title compound, strontium trimanganese tris­(ortho­phosphate), was synthesized under hydro­thermal conditions. Its structure is isotypic to that of the lead analogue PbMn II   2 Mn III (PO 4 ) 3 . Two O atoms are in general positions, whereas all others atoms are in special positions. The Sr and one P atom exhibit  mm 2 symmetry, the Mn II  atom 2/ m  symmetry, the Mn III  atom and the other P atom .2. symmetry and two O atoms are located on mirror planes. The three-dimensional network of the crystal structure is made up of two types of chains running parallel to [010]. One chain is linear and is composed of alternating Mn III O 6  octa­hedra and PO 4  tetra­hedra sharing vertices; the other chain has a zigzag arrangement and is built up from two edge-sharing Mn II O 6  octa­hedra connected to PO 4  tetra­hedra by edges and vertices. The two types of chains are linked through PO 4  tetra­hedra, leading to the formation of channels parallel to [100] and [010] in which the Sr II  ions are located. They are surrounded by eight O atoms in the form of a slightly distorted bicapped trigonal prism.

SrMnII2MnIII(PO4)3

SrMn^II₂Mn^III(PO₄)₃