Muscovite Radoslovich E Acta Crystallographica 13 (1960) 919-932 The Structure of Muscovite, K Al2 (Si3 Al) O10 (O H)2 _cod_database_code 1100012 _database_code_amcsd 0018220 5.189 8.996 20.095990000 90 95.18 90 C2/c atom x y z occ Al1 .2484 .0871 .0016 O1 .465 .945 .0527 O2 .4250 .26 .0542 O3 .453 .558 .052 O4 .4080 .096 .168 O5 .245 .802 .162 O6 .2629 .3713 .1674 Si1 .4625 .9242 .1372 .5 Si2 .4593 .255 .1365 Al2 .4625 .9242 .1372 .5 K1 0 .1016 .25