Gearksutite Marchetti F, Perchiazzi N American Mineralogist 85 (2000) 231-235 The crystal structure of gearksutite, CaAlF4(OH).H2O _database_code_amcsd 0002346 4.940 6.810 6.978 101.12 94.86 110.07 P-1 atom x y z Uiso Ca .3562 .3876 .2225 .010 Al -.0055 .8281 .3384 .008 F1 .2315 .6851 .2942 .014 F2 .1998 .0205 .2080 .013 F3 .7342 .6746 .1146 .013 F4 .2343 .3701 .5394 .012 OW .7835 .2524 .1499 .015 O1 .2202 .9948 .5884 .009