Fluornatromicrolite
Andrade M B, Atencio D, Menezes L A D, Ellena J
The Canadian Mineralogist 49 (2011) 615-621
The crystal structure of a microlite-group mineral with a formula near NaCaTa2O6F
from the Morro Redondo mine, Coronel Murta, Minas Gerias, Brazil
Locality: Morro Redondo mine, Coronel Murta, Minas Gerias, Brazil
_database_code_amcsd 0018462
10.4396 10.4396 10.4396 90 90 90 *Fd3m
.125 .125 .125
atom     x    y    z occ  Uiso
NaA     .5   .5   .5 .44 .0181
CaA     .5   .5   .5 .44 .0181
PbA     .5   .5   .5 .01 .0181
TaB      0    0    0 .85 .0126
NbB      0    0    0 .07 .0126
SiB      0    0    0 .06 .0126
AsB      0    0    0 .02 .0126
O1   .0684 .375 .375 .96 .0207
OH1  .0684 .375 .375 .04 .0207
F     .375 .375 .375 .73  .013