Pargasite
Welch M D, Knight K S
European Journal of Mineralogy 11 (1999) 321-331
A neutron powder diffraction study of cation ordering in
high-temperature synthetic amphiboles
_database_code_amcsd 0006771
9.8930 17.937 5.2802 90 105.518 90 C2/m
atom       x     y     z occ  Uiso
NaA2/m     0    .5     0      .068
MgM1       0 .0881    .5     .0057
MgM2       0 .1761     0 .75 .0011
AlM2       0 .1761     0 .25 .0011
MgM3       0     0     0  .5 .0067
AlM3       0     0     0  .5 .0067
CaM4       0 .2804    .5     .0104
SiT1   .2807 .0861 .3040 .58 .0023
AlT1   .2807 .0861 .3040 .42 .0023
SiT2   .2884 .1734 .8171 .92 .0025
AlT2   .2884 .1734 .8171 .08 .0025
O1     .1070 .0866 .2185     .0093
O2     .1199 .1726 .7330     .0078
O3     .1061     0 .7176     .0010
O4     .3658 .2506 .7863     .0072
O5     .3489 .1399 .1165     .0059
O6     .3436 .1135 .6191     .0089
O7     .3414     0 .2672     .0083
H      .2045     0 .7796      .045