Alunite
Zema M, Callegari A M, Tarantino S C, Gasparini E, Ghigna P
Mineralogical Magazine 76 (2012) 613-623
Thermal expansion of alunite up to dehydroxylation
and collapse of the crystal structure
Note: T = 300 C
Locality: Hungary
_database_code_amcsd 0018987
6.9859 6.9859 17.481 90 90 120 R-3m
atom      x       y       z  occ Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
KA        0       0       0 .876 .023   .027      0   .017   .013      0      0
NaA       0       0       0 .071 .023   .027      0   .017   .013      0      0
Al        0      .5      .5 .963 .010   .007   .009   .014   .003      0      0
S         0       0  .30179      .012   .012      0   .011   .006      0      0
O1        0       0  .38430      .021   .025      0   .011   .013      0      0
O2   .21854 -.21854 -.06078      .017   .020   .020   .016   .014      0      0
O3   .12611 -.12611  .14039      .015   .011   .011   .020   .005   .002   .002
H     .1840  -.1840   .1110      .041