Cummingtonite
Yang H, Hazen R M, Prewitt C T, Finger L W, Lu R, Hemley R J
American Mineralogist 83 (1998) 288-299
High-pressure single-crystal X-ray diffraction and infrared spectroscopic
studies of the C2/m-P2_1/m phase transition in cummingtonite
Sample: P = 0.60 GPa
_database_code_amcsd 0001971
9.4890 18.1508 5.3102 90 102.210 90 C2/m
atom     x     y     z  occ Biso
Fe1      0 .0871    .5 .405  .69
Mg1      0 .0871    .5 .595  .69
Fe2      0 .1776     0 .207  .71
Mg2      0 .1776     0 .789  .71
Al2      0 .1776     0 .004  .71
Fe3      0     0     0 .393  .70
Mg3      0     0     0 .607  .70
Fe4      0 .2590    .5 .927  .92
Mg4      0 .2590    .5 .035  .92
Ca4      0 .2590    .5 .038  .92
Si1  .2883 .0840 .2757       .60
Si2  .2978 .1686 .7818       .63
O1   .1160 .0871 .2096       .79
O2   .1266 .1724 .7202       .69
O3   .1166     0 .7093       .80
O4   .3807 .2451 .7675      1.07
O5   .3527 .1309 .0640       .85
O6   .3524 .1184 .5607      1.24
O7   .3432     0 .2694      1.02