Na2Mg6Si8O22(OH)2
Camara F, Oberti R, Iezzi G, Della Ventura G
Physics and Chemistry of Minerals 30 (2003) 570-581
The P2_1/m - C2/m phase transition in synthetic amphibole
Na NaMg Mg5 Si8 O22 (OH)2: thermodynamic and crystal-chemical evaluation
Sample: T = 370 C
_database_code_amcsd 0008835
9.737 18.049 5.303 90 102.22 90 C2/m
atom      x     y     z  occ Biso B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3)
NaA       0    .5     0  .31 2.64  .0045  .0043  .0031      0 -.0028      0
NaAm  .0340    .5 .1132  .25 3.21  .0070  .0041  .0144      0  .0002      0
Mg1       0 .0882    .5      1.14  .0049  .0012  .0035      0  .0041      0
Mg2       0 .1801     0      1.37  .0035  .0009  .0151      0  .0012      0
Mg3       0     0     0      1.59  .0053  .0003  .0207      0  .0001      0
Mg4       0 .2617    .5 .595 2.36  .0058  .0031  .0127      0  .0076      0
Na4       0 .2617    .5 .405 2.36  .0058  .0031  .0127      0  .0076      0
Si1   .2812 .0850 .2756       .80  .0023  .0008  .0056 -.0001  .0012  .0001
Si2   .2917 .1707 .7826       .97  .0037  .0007  .0067 -.0003  .0013  .0001
O1    .1133 .0862 .2098       .93  .0020  .0009  .0102      0  .0036 -.0001
O2    .1218 .1722 .7198      1.44  .0052  .0011  .0071 -.0005 -.0020 -.0005
O3    .1090     0 .7091      1.79  .0057  .0006  .0225      0  .0022      0
O4    .3728 .2467 .7846      2.04  .0069  .0015  .0128 -.0012 -.0008  .0006
O5    .3466 .1263 .0572      1.85  .0056  .0021  .0083 -.0001  .0029  .0026
O6    .3445 .1193 .5583      1.98  .0032  .0025  .0143  .0005  .0010 -.0029
O7    .3389     0 .2758      1.70  .0031  .0011  .0245      0  .0026      0
H      .177     0  .733      2.84