Fluornatromicrolite
Witzke T, Steins M, Doering T, Schuckmann W, Wegner R, Pollmann H
The Canadian Mineralogist 49 (2011) 1105-1110
Fluornatromicrolite, (Na,Ca,Bi)2Ta2O6F, a new mineral species
from Quixaba, Paraiba, Brazil
Locality: Quixaba, Paraiba, Brazil
_database_code_amcsd 0018616
10.4451 10.4451 10.4451 90 90 90 *Fd3m
.125 .125 .125
atom      x    y    z  occ  Uiso U(1,1) U(2,2) U(3,3)  U(1,2)  U(1,3)  U(2,3)
Na        0    0    0 .555  .038   .038   .038   .038  -.0098  -.0098  -.0098
Ca        0    0    0 .325  .038   .038   .038   .038  -.0098  -.0098  -.0098
Bi        0    0    0 .075  .038   .038   .038   .038  -.0098  -.0098  -.0098
Ta       .5   .5   .5      .0149  .0149  .0149  .0149 -.00072 -.00072 -.00072
O    -.1828 .125 .125      .0183   .020   .017   .017       0       0    .006
F      .125 .125 .125       .027   .027   .027   .027       0       0       0