Kalsilite Cellai D, Bonazzi P, Carpenter M A American Mineralogist 82 (1997) 276-279 Natural kalsilite, KAlSiO4, with P31c symmetry: Crystal structure and twinning _database_code_amcsd 0001874 5.157 5.157 8.706 90 90 120 P31c atom x y z U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) K 0 0 .25 .0154 .0154 .0187 .0077 0 0 Al1 1/3 2/3 .0594 .0013 .0013 .0112 .00065 0 0 Si2 1/3 2/3 .4416 .0104 .0104 .0058 .0052 0 0 O1 .616 .011 .000 .009 .009 .031 .003 .006 .004 O2 1/3 2/3 .260 .036 .036 .004 .018 0 0