Jakobssonite Hemon A, Courbion G Acta Crystallographica C47 (1991) 1302-1303 Refinement of the room-temperature structure of alpha-CaAlF5 _cod_database_code 1000300 _database_code_amcsd 0010259 8.712 6.317 7.349 90 115.04 90 C2/c atom x y z U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Ca 0 .5424 .25 .0074 .0077 .0068 0 .0031 .0 Al 0 0 0 .0068 .0059 .0058 -.0002 .0029 .0001 F1 0 .9422 .25 .0207 .0110 .0085 0 .0089 0 F2 .0114 .7169 .9737 .0223 .0066 .0114 .0006 .0098 -.0006 F3 .7789 .9822 .8870 .0070 .0243 .0191 -.0011 .0029 .0000