AM_Seamanite Formula: Mn3 P B (O10 H6) Name: Seamanite Unit cell: 7.811 15.114 6.691 90.0 90.0 90.0 , V=789.91 Space group: PBNM (62)

Moore P B , Ghose S , American Mineralogist , 56 (1971) p.1527-1538, A novel face-sharing octahedral trimer in the crystal structure of seamanite