Dravite
Foit F F, Rosenberg P E
American Mineralogist 64 (1979) 788-798
The structure of vanadium-bearing tourmaline and its implications regarding
tourmaline solid solutions
Locality: Silver Knob, Mariposa County, California, USA
_database_code_amcsd 0000739
15.967 15.967 7.191 90 90 120 R3m
atom      x       y      z occ B(1,1) B(2,2) B(3,3)  B(1,2)  B(1,3)   B(2,3)
NaX       0       0 .21764 .46 .00196 .00196 .00670  .00098       0        0
CaX       0       0 .21764 .36 .00196 .00196 .00670  .00098       0        0
MgX       0       0 .21764 .18 .00196 .00196 .00670  .00098       0        0
MgY  .12353 .061765 .63364 .62 .00058 .00042 .00306  .00029 -.00047 -.000235
VY   .12353 .061765 .63364 .25 .00058 .00042 .00306  .00029 -.00047 -.000235
CrY  .12353 .061765 .63364 .06 .00058 .00042 .00306  .00029 -.00047 -.000235
FeY  .12353 .061765 .63364 .06 .00058 .00042 .00306  .00029 -.00047 -.000235
AlZ  .29782 .261520 .61011 .93 .00044 .00051 .00181  .00022 0.00001  0.00011
VZ   .29782 .261520 .61011 .06 .00044 .00051 .00181  .00022 0.00001  0.00011
TiZ  .29782 .261520 .61011 .01 .00044 .00051 .00181  .00022 0.00001  0.00011
SiT  .19173 .189900      0 .94 .00039 .00039 .00192  .00018 -.00002  -.00009
AlT  .19173 .189900      0 .06 .00039 .00039 .00192  .00018 -.00002  -.00009
B    .10976 .219520 .45178     .00046 .00041 .00277 .000205 -.00001  -.00002
OH1       0       0 .77026     .00113 .00113 .00341 .000565       0        0
O2   .06085 .121700 .48140     .00099 .00048 .00541  .00024 0.00011  0.00022
O3   .26387 .131935 .50919     .00187 .00104 .00242 .000935 0.00011 0.000055
O4   .09306 .186120 .07162     .00075 .00157 .00398 .000785 -.00014  -.00028
O5   .18444 .092220 .09256     .00180 .00071 .00420  .00090 0.00004  0.00002
O6   .19548 .185760 .77616     .00087 .00082 .00218  .00044 -.00008  -.00021
O7   .28559 .285360 .07803     .00073 .00063 .00294  .00014 -.00030  -.00015
O8   .20903 .269840 .43879     .00036 .00080 .00484  .00027 0.00019  0.00040
H3   .26150 .130750 .39010