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 = 140 C
_database_code_amcsd 0008833
9.706 17.986 5.286 90 102.37 90 P2_1/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   .2707   .25 .0444  .81 3.83  .0063  .0044  .0414      0  .0130      0
Mg1  -.2485 .3382 .4908       .64  .0023  .0005  .0048      0  .0008 -.0001
Mg2  -.2503 .4296 .9829       .65  .0021  .0004  .0063      0  .0010  .0002
Mg3  -.2533   .25 .9898       .61  .0021  .0004  .0050      0  .0004      0
Mg4  -.2406 .5059 .4925 .595  .80  .0024  .0007  .0072      0  .0027  .0002
Na4' -.2593 .5228 .4710 .405 1.46
Si1A  .0323 .3359 .2645       .50  .0017  .0004  .0043 -.0001  .0005 -.0001
Si1B  .5306 .8343 .2894       .49  .0017  .0004  .0037      0  .0006  .0001
Si2A  .0401 .4216 .7722       .52  .0017  .0004  .0041 -.0001  .0005 -.0001
Si2B  .5446 .9195 .7963       .60  .0020  .0005  .0046 -.0003  .0004  .0002
O1A  -.1388 .3357 .1957       .59  .0019  .0005  .0048 -.0001  .0007 -.0002
O1B  -.1278 .4211 .7126       .58  .0018  .0005  .0046      0  .0006      0
O2A   .3651 .8370 .2278       .72  .0018  .0007  .0062 -.0001  .0010 -.0005
O2B   .3701 .9216 .7263       .77  .0025  .0007  .0050 -.0001  .0008 -.0003
OH3A -.1361   .25 .6983       .68  .0022  .0005  .0058      0  .0007      0
OH3B  .3551   .75 .7236       .71  .0017  .0006  .0071      0  .0009      0
O4A   .1246 .4986 .7891      1.08  .0042  .0005  .0093 -.0006 -.0007 -.0002
O4B   .6204 .9947 .7724      1.86  .0066  .0011  .0127 -.0017 -.0039  .0018
O5A   .0961 .3692 .0319       .95  .0024  .0010  .0074  .0001  .0013  .0012
O5B   .5987 .8833 .0878       .90  .0023  .0008  .0076 -.0002  .0009  .0009
O6A   .0985 .3777 .5357      1.00  .0023  .0010  .0082  .0003      0 -.0017
O6B   .5943 .8586 .5877      1.01  .0023  .0012  .0059  .0002  .0003 -.0011
O7A   .0942   .25 .3001       .86  .0024  .0004  .0116      0  .0012      0
O7B   .5869   .75 .2608       .87  .0021  .0004  .0136      0  .0019      0