Nacrite
Gruner J
Zeitschrift fur Kristallographie 85 (1933) 345-354
The crystal structure of Nacrite and a comparison of certain optical
properties of the caolin group with its structures
_cod_database_code 1011080
_database_code_amcsd 0017977
5.16 8.93 28.659990000 90 91.72 90 Cc
atom      x      y      z
Al1    -.25  .3333      0
Al2    -.25      0      0
Al3   .0833      0    .25
Al4   .0833 -.3333    .25
Si1   .4306  .3333  .0938
Si2   .4306      0   .094
Si3   .4306 -.3333  .3438
Si4   .4306      0  .3438
O1   -.0778     .5 .03819
O2   -.0778 -.1667 .03819
O3    .4361  .1667  .1146
O4    .1861  .4167  .1146
O5    .1861 -.0833  .1146
O6   -.0778    -.5  .2882
O7   -.0778  .1667  .2882
O8    .4361 -.1667  .3646
O9    .1861 -.4167  .3646
O10   .1861  .0833  .3646
O11  -.0778  .1667 .03819
O12  -.2556 -.3333  .2119
O13  -.2556      0  .2119
O14  -.2556  .3333  .2119
O15  -.0778  -.167  .2882
O16   .0778 -.3333  .4618
O17   .0778      0  .4618
O18   .0778  .3333  .4618