Muscovite Catti M, Ferraris G, Ivaldi G European Journal of Mineralogy 1 (1989) 625-632 Thermal strain analysis in the crystal structure of muscovite at 700 C T = 25 C _database_code_amcsd 0006358 5.191 9.006 20.068 90 95.77 90 C2/c atom x y z occ Biso K 0 .0989 1/4 .88 1.86 Na 0 .0989 1/4 .11 1.86 Al .2502 .0834 .0001 .96 .81 Fe .2502 .0834 .0001 .03 .81 Mg .2502 .0834 .0001 .01 .81 AlT1 .4650 .9298 .1354 .23 .90 SiT1 .4650 .9298 .1354 .77 .90 AlT2 .4513 .2585 .1355 .23 .91 SiT2 .4513 .2585 .1355 .77 .91 O1 .4146 .0932 .1685 1.38 O2 .2519 .8096 .1573 1.50 O3 .2515 .3716 .1689 1.39 O4 .4623 .9442 .0535 1.01 O5 .3835 .2515 .0534 1.01 O6 .4577 .5614 .0500 1.10 H .371 .627 .050 6.3