Phengite Pavese A, Ferraris G, Pischedda V, Ibberson R European Journal of Mineralogy 11 (1999) 309-320 Tetrahedral order in phengite 2M_1 upon heating, from powder neutron diffraction, and thermodynamic consequences Sample: T = 873 K _database_code_amcsd 0006769 5.23899 9.1048 20.2440 90 95.684 90 C2/c atom x y z occ Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) K 0 .088 1/4 .94 .049 Na 0 .088 1/4 .03 .049 AlM2 .2495 .0811 .0020 .835 .0333 MgM2 .2495 .0811 .0020 .02 .0333 FeM2 .2495 .0811 .0020 .17 .0333 SiT1 .4643 .9277 .1336 .62 .025 AlT1 .4643 .9277 .1336 .38 .025 SiT2 .4501 .2615 .1350 .015 O1 .4516 .0952 .1676 .046 O2 .2317 .8228 .1586 .054 O3 .2326 .3534 .1688 .039 O4 .4644 .9421 .0537 .043 O5 .3943 .2530 .0546 .029 O6 .4573 .5642 .0485 .94 .047 F6 .4573 .5642 .0485 .06 .047 H .366 .6464 .0650 .94 .19 .054 .23 .011 .03 .046