Offretite
Gualtieri A, Artioli G, Passaglia E, Bigi S, Viani A, Hanson J C
American Mineralogist 83 (1998) 590-606
Crystal structure-crystal chemistry relationships in the zeolites erionite
and offretite
Sample from Mt. Semiol
_database_code_amcsd 0002005
13.293 13.293 7.608 90 90 120 P-6m2
atom       x     y     z occ Uiso
Si1   -.0004 .2308 .2067 .71 .028
Al1   -.0004 .2308 .2067 .29 .028
Si2    .0919 .4210    .5 .71 .030
Al2    .0919 .4210    .5 .29 .030
Ca1      2/3   1/3  .353 .43 .067
Ca2      2/3   1/3  .245 .27 .052
K          0     0    .5     .040
Mg       1/3   2/3     0     .026
O1     .0267 .3476 .3188     .030
O2     .0942 .9056 .2340     .016
O3     .8849 .1151 .2807     .026
O4     .0093 .2722     0     .032
O5     .2271 .7729    .5     .010
O6     .4545 .5455    .5     .051
Wat1     1/3   2/3 .2587     .043
Wat2   .2437 .7563     0 .80 .041
Wat3   .1740 .4957     0 .30 .060
Wat4   .7579 .2421    .5     .058
Wat5  -.4357 .4357 .1713 .35 .042
Wat5b -.4820 .4820 .1231 .37 .042