AM_Shigaite Formula: Mn6 Al3 Na S2 H42 O38 Name: Shigaite Unit cell: 9.512 9.512 33.074 90.0 90.0 120.0 , V=2591.56 Space group: R11-3 (1)

Cooper M A , Hawthorne F C , The Canadian Mineralogist , 34 (1996) p.91-97, The crystal structure of shigaite, [AlMn2(OH)6]3(SO4)2Na(H2O)6{H2O}6, a, hydrotalcite-group mineral