Cummingtonite
Yang H, Hirschmann M M
American Mineralogist 80 (1995) 916-922
Crystal structure of P2_1/m ferromagnesian amphibole and the role of cation
ordering and composition in the P2_1/m - C2/m transition in cummingtonite
Sample: UH1, untreated
_database_code_amcsd 0001752
9.5015 18.1289 5.3089 90 102.090 90 C2/m
atom     x     y     z  occ  Biso
Fe1      0 .0869    .5 .200  .671
Mg1      0 .0869    .5 .800  .671
Fe2      0 .1771     0 .091  .693
Mg2      0 .1771     0 .903  .693
Al2      0 .1771     0 .006  .693
Fe3      0     0     0 .164  .521
Mg3      0     0     0 .836  .521
Fe4      0 .2589    .5 .906  .931
Mg4      0 .2589    .5 .051  .931
Ca4      0 .2589    .5 .043  .931
Si1  .2879 .0842 .2745       .561
Si2  .2979 .1688 .7812       .572
O1   .1142 .0869 .2092       .681
O2   .1232 .1721 .7193       .722
O3   .1133     0 .7068       .846
O4   .3805 .2454 .7689       .917
O5   .3514 .1313 .0646      1.036
O6   .3499 .1185 .5586      1.177
O7   .3434     0 .2699      1.026