Minamiite
Ossaka J, Hirabayashi J, Okada K, Kobayashi R, Hayashi T
American Mineralogist 67 (1982) 114-119
Crystal structure of minamiite, a new mineral of the alunite group
Note: mineral has been redefined as the 2R polytype of natroalunite
_database_code_amcsd 0000857
6.981 6.981 33.490 90 90 120 R-3m
atom     x      y     z occ Biso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
S1       0      0 .8458          0.0019 0.0019 0.0111 .00095      0      0
S2       0      0 .3473          0.0110 0.0110 0.0043 0.0055      0      0
Al   .5001 -.5001 .2496          0.0053 0.0053 0.0093 0.0029 -.0001 0.0001
O1       0      0 .8022          0.0166 0.0166 0.0076 0.0083      0      0
O2       0      0 .3043          0.0091 0.0091 0.0076 .00455      0      0
O3   .2181 -.2181 .0290          0.0119 0.0119 0.0103 0.0098 0.0010 -.0010
O4   .2183 -.2183 .5274          0.0116 0.0116 0.0105 0.0082 0.0005 -.0005
Oh5  .1268 -.1268 .9294          0.0078 0.0078 0.0145 0.0053 -.0023 0.0023
Oh6  .1239 -.1239 .4321          0.0035 0.0035 0.0174 -.0010 -.0017 0.0017
K        0      0     0 .20 2.4
Na1      0      0     0 .44 2.4
Na2      0      0    .5 .28 1.9
Ca       0      0    .5 .54 1.9
H1    .180  -.180 .9483     3.0
H2    .180  -.180 .4477     3.0