Pigeonite
Nestola F, Tribaudino M, Ballaran T B
American Mineralogist 89 (2004) 189-196
High pressure behavior, transformation and crystal structure of synthetic iron-free pigeonite
Sample: P = 6.2 GPa
_database_code_amcsd 0003200
9.291 8.679 4.963 90 102.22 90 C2/c
atom      x      y      z occ Biso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
MgM2      0  .2789    .25 .85   .8  .0093  .0147  .0073      0  .0017      0
CaM2      0  .2789    .25 .15   .8  .0093  .0147  .0073      0  .0017      0
MgM1      0  .9065    .25      .55
SiT   .2976  .0918  .2139      .49
O1    .1214  .0905   .139      .63
O2    .3764  .2391   .364      .83
O3    .3546  .0562   .925      .69