Phengite-2M1
Ivaldi G, Ferraris G, Curetti N, Compagnoni R
European Journal of Mineralogy 13 (2001) 1025-1034
Coexisting 3T and 2M_1 polytypes of phengite from Cima Pal (Val Savenca, western Alps):
Chemical and polytypic zoning and structural characterisation
Sample: 2M1G
Locality: Cima Pal, Val Savenca, western Alps
_database_code_amcsd 0006915
5.225 9.057 19.956 90 95.73 90 C2/c
atom      x      y      z   occ  Uiso
KI        0 .09564    1/4   .99 .0254
NaI       0 .09564    1/4   .02 .0254
AlM2 .24663 .08226 .00003   .71 .0081
MgM2 .24663 .08226 .00003  .165 .0081
FeM2 .24663 .08226 .00003   .12 .0081
TiM2 .24663 .08226 .00003   .02 .0081
SiT1 .46349 .92899 .13551 .8625 .0083
AlT1 .46349 .92899 .13551 .1375 .0083
SiT2 .45222 .25859 .13555 .8625 .0092
AlT2 .45222 .25859 .13555 .1375 .0092
O1    .4469  .0934 .16886       .0159
O2    .2333  .8279 .16095       .0171
O3    .2329  .3552 .16929       .0161
O4    .4567  .9386 .05410       .0132
O5    .3946  .2515 .05413       .0133
O6    .4557  .5646 .05271       .0177
H      .378   .629   .058         .07