Protoferro-anthophyllite
Sueno S, Matsuura S, Gibbs G V, Boisen M B
Physics and Chemistry of Minerals 25 (1998) 366-377
A crystal chemical study of protoanthophyllite:
orthoamphiboles with the protoamphibole structure
Sample: PFA Hiruka Village
_database_code_amcsd 0008147
9.388 18.387 5.347 90 90 90 Pnmn
atom     x      y     z occ Biso
FeM1     0 .08826    .5      .55
FeM2     0 .17998     0 .95  .45
MgM2     0 .17998     0 .05  .45
FeM3     0      0     0      .54
FeM4     0 .25880    .5 .80  .75
MnM4     0 .25880    .5 .20  .75
Si1  .2850  .0835 .1635      .45
Si2  .2972  .1667 .6611      .49
O1   .1127  .0881 .1621      .65
O2   .1254  .1741 .6646      .69
OH3  .1139      0 .6613      .74
O4   .1163  .2583 .1912      .85
O5   .3472  .1247 .4083      .89
O6   .3478  .1211 .9123     1.07
O7   .3379      0 .1722     1.00