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 #1 from Fitta
_database_code_amcsd 0002006
13.390 13.390 7.598 90 90 120 P-6m2
atom      x     y     z occ Uiso
Si1  -.0014 .2321 .2087 .70 .039
Al1  -.0014 .2321 .2087 .30 .039
Si2   .0884 .4231    .5 .70 .020
Al2   .0884 .4231    .5 .30 .020
Ca1     2/3   1/3 .4021 .40 .042
Ca2     2/3   1/3 .2664 .36 .048
K         0     0    .5 .96 .051
Mg      1/3   2/3     0 .97 .043
O1    .0260 .3494 .3160     .020
O2    .0962 .9037 .2500     .028
O3    .8734 .1265 .2926     .066
O4    .0052 .2644     0     .022
O5    .2331 .7668    .5     .026
O6    .4602 .5397    .5     .037
Wat1    1/3   2/3 .2335     .120
Wat2  .2432 .7568     0 .81 .063
Wat3  .1350 .5104     0 .26 .060
Wat4  .7663 .2337    .5 .85 .056
Wat5 -.4325 .4325 .1682     .062
Wat6 -.2539 .2539     0 .32 .060