Osumilite
Brown G E, Gibbs G V
American Mineralogist 54 (1969) 101-116
Refinement of the crystal structure of osumilite
_database_code_amcsd 0000188
10.155 10.155 14.284 90 90 120 P6/mcc
atom     x     y     z  occ Biso
K        0     0   .25  .71  3.6
Na       0     0   .25  .28  3.6
Ca       0     0   .25  .01  3.6
Mg   .3333 .6667   .25  .46  .90
Fe   .3333 .6667   .25  .46  .90
Mn   .3333 .6667   .25  .08  .90
Si1  .1037 .3513 .1085  .85 1.25
Al1  .1037 .3513 .1085  .15 1.25
Al2     .5     0   .25  .88 1.31
Fe2     .5     0   .25  .12 1.31
O1   .1216 .4046     0       2.5
O2   .2142 .2837 .1316       2.4
O3   .1372 .4913 .1789       1.8
Wat   .031  .114     0 .166    9