Chabazite-Ca Dent L S, Smith J V Nature 181 (1958) 1794-1796 Crystal structure of chabazite, a molecular sieve Note: extra-framework cations not located _database_code_amcsd 0017695 9.4 9.4 9.4 94.3 94.3 94.3 R-3m atom x y z occ Al1 .34 .11 -.12 .32 Si1 .34 .11 -.12 .68 O1 .27 -.27 0 O2 .17 -.17 .5 O3 .25 .25 .9 O4 .03 .03 .35