Stratlingite Rinaldi R, Sacerdoti M, Passaglia E European Journal of Mineralogy 2 (1990) 841-849 Stratlingite: crystal structure, chemistry, and a reexamination of its polytype vertumnite _database_code_amcsd 0006404 5.745 5.745 37.77 90 90 120 R-3m atom x y z occ Uiso Al 0 0 0 .014 Ca 1/3 2/3 .0142 .016 Al1 0 0 .1237 .27 .032 Si1 0 0 .1237 .27 .032 Al2 2/3 1/3 .1227 .285 .033 Si2 2/3 1/3 .1227 .285 .033 O1 2/3 1/3 .1662 .086 OH1 .830 .170 .1067 .112 OH2 .749 .054 .0268 .5 .012 Wat1 1/3 2/3 .1667 .25 .098 Wat2 1/3 2/3 .0812 .035