Pyrophyllite
Wardle R, Brindley G W
American Mineralogist 57 (1972) 732-750
The crystal structures of pyrophyllite, 1Tc, and of its dehydroxylate
_database_code_amcsd 0000285
5.1614 8.9576 9.3511 91.03 100.37 89.75 C-1
atom    x    y    z
Al     .5 .167    0
Si1  .748    0 .289
Si2  .759 .331 .289
O1   .671 .004 .113
O2   .721 .319 .113
OH   .221 .186 .113
Ob1  .055 .387 .353
Ob2  .724 .167 .353
Ob3  .550 .448 .336