AM_Katoptrite Formula: Mn13 Sb2 Al4 Si2 O28 Name: Katoptrite Unit cell: 5.617 23.02 9.079 90.0 101.38 90.0 , V=1150.87 Space group: C12/M1 (12)

Moore P B , Araki T , Brunton G D , Neues Jahrbuch fur Mineralogie, Abhandlungen , 127 (1976) p.47-61, Catoptrite, (Mn2+5Sb5+2)VI(Mn2+8Al4Si2)IVO28,, a novel close-packed oxide sheet structure, Locality: Langban, Sweden