Pigeonite
Angel R J, McCammon C A, Woodland A B
Physics and Chemistry of Minerals 25 (1998) 249-258
Structure, ordering and cation interactions in Ca-free P2_1/c clinopyroxenes
Sample: H162
Note: x coordinate of O2B changed by author, May, 2004
_database_code_amcsd 0008137
9.6519 8.9075 5.2004 90 108.590 90 P2_1/c
atom     x     y     z  occ Biso B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3)
MgM1 .2512 .6539 .2201 .779 1.01  .0026  .0026  .0125 -.0010  .0010 -.0010
FeM1 .2512 .6539 .2201 .221 1.01  .0026  .0026  .0125 -.0010  .0010 -.0010
MgM2 .2570 .0153 .2202 .441 1.28  .0037  .0045  .0115 -.0006  .0014 -.0015
FeM2 .2570 .0153 .2202 .559 1.28  .0037  .0045  .0115 -.0006  .0014 -.0015
SiA  .0431 .3401 .2899       .79  .0022  .0028  .0081  .0001  .0016 -.0002
SiB  .5531 .8359 .2354       .73  .0018  .0025  .0082 -.0002  .0013 -.0008
O1A  .8691 .3376 .1821       .97  .0040  .0038  .0048 -.0011  .0025 -.0010
O1B  .3750 .8388 .1287       .72  .0017  .0024  .0063  .0003 -.0007 -.0018
O2A  .1239 .4993 .3283       .81  .0024  .0022  .0083 -.0001  .0005  .0015
O2B  .6344 .9819 .3869      1.21  .0030  .0032  .0155 -.0006  .0015  .0032
O3A  .1047 .2729 .6053      1.11  .0032  .0039  .0083  .0000 -.0004  .0004
O3B  .6048 .7006 .4625       .99  .0025  .0030  .0133  .0008  .0026  .0003