Fluorcalciopyrochlore
Zaitsev A N, Spratt J, Shtukenberg A G, Zolotarev A A, Britvin S N,
Petrov S V, Kuptsova A V, Antonov A V
Mineralogical Magazine 85 (2021) 532-553
Oscillatory- and sector-zoned pyrochlore from carbonatites of the Kerimasi
volcano, Gregory rift, Tanzania
Sample: KS 23
Locality: Kisete crater, Kerimasi volcano, Gregory rift, Tanzania
_database_code_amcsd 0021052
10.3975 10.3975 10.3975 90 90 90 *Fd-3m
.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)
Ca         0   .5    0  .58  .0149  .0149  .0149  .0149 -.00301 -.00301 -.00301
Na         0   .5    0  .39  .0149  .0149  .0149  .0149 -.00301 -.00301 -.00301
U          0   .5    0 .015  .0149  .0149  .0149  .0149 -.00301 -.00301 -.00301
Sr         0   .5    0  .01  .0149  .0149  .0149  .0149 -.00301 -.00301 -.00301
Nb       .75   .5  .25 .835 .01182 .01182 .01182 .01182  .00067 -.00067  .00067
Ti       .75   .5  .25  .11 .01182 .01182 .01182 .01182  .00067 -.00067  .00067
Si       .75   .5  .25  .03 .01182 .01182 .01182 .01182  .00067 -.00067  .00067
Fe       .75   .5  .25  .02 .01182 .01182 .01182 .01182  .00067 -.00067  .00067
Zr       .75   .5  .25 .005 .01182 .01182 .01182 .01182  .00067 -.00067  .00067
O     .81957 .625 .125  .98  .0130  .0154  .0118  .0118       0       0   .0046
OH    .81957 .625 .125  .02  .0130  .0154  .0118  .0118       0       0   .0046
F       .125 .625 .125  .90  .0146  .0146  .0146  .0146       0       0       0
OH      .125 .625 .125  .10  .0146  .0146  .0146  .0146       0       0       0