LiMn3(SeO3)2(HSeO3)6

The title compound, lithium trimanganese bis­trioxo­selenate(IV)] hexa­kishydrogentrioxoselenate(IV)], is built up from a vertex‐sharing network of distorted Mn^IIIO₆ octa­hedra, SeO₃ and HSeO₃ pyramids and unusual Li(OH)₆ octa­hedra, resulting in a dense three‐dimensional structure. Mn, Li and one Se atom have site symmetries of , , and 3, respectively. An O—H?O hydrogen bond helps to establish the crystal packing.