Nosean Hassan I, Grundy H D The Canadian Mineralogist 27 (1989) 165-172 The structure of nosean, ideally Na8(Al6Si6O24)SO4.H2O Note: O2 z-coordinate has been corrected according to the ICSD _database_code_amcsd 0005223 9.084 9.084 9.084 90 90 90 P-43n atom x y z occ Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Al .25 0 .5 .039 .039 .039 0 0 0 Si .25 .5 0 .020 .020 .020 .0320 .0320 .0320 O1 .137 .146 .544 .5 .039 O2 .153 .160 .475 .5 .035 Na1 .303 .303 .303 .21 .021 Na2 .674 .674 .674 .34 .046 Na3 .733 .733 .733 .46 .029 Wat3 .470 .470 .470 .12 .024 S 0 0 0 .49 .161 O4 .405 .405 .405 .49 .131