Carlosbarbosaite
Atencio D, Roberts A C, Cooper M A, Menezes L A D, Coutinho J M V,
Stirling J A R, Venance K E, Ball N A, Moffatt E, Chaves M L S C,
Brandao P R G, Romano A W
Mineralogical Magazine 76 (2012) 75-90
Carlosbarbosaite, ideally (UO2)2Nb2O6(OH)2*2H2O, a new hydrated uranyl
niobate mineral with tunnels from Jaguaracu, Minas Gerais, Brazil:
description and crystal structure
Locality: Jaguaracu, Minas Gerais, Brazil
_database_code_amcsd 0018664
14.150 10.395 7.529 90 90 90 Cmcm
atom      x      y      z occ  Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
U    .26634 .27203    .25 .72 .0343  .0279  .0507  .0244 -.0115      0      0
Nb   .38296     .5      0 .40 .0281  .0133  .0443  .0267      0      0 -.0001
Ta   .38296     .5      0 .26 .0281  .0133  .0443  .0267      0      0 -.0001
Si   .38296     .5      0 .13 .0281  .0133  .0443  .0267      0      0 -.0001
Ti   .38296     .5      0 .11 .0281  .0133  .0443  .0267      0      0 -.0001
Al   .38296     .5      0 .05 .0281  .0133  .0443  .0267      0      0 -.0001
Fe   .38296     .5      0 .05 .0281  .0133  .0443  .0267      0      0 -.0001
Ca       .5  .0127    .25 .28  .057   .055   .051   .066      0      0      0
Nd       .5  .0127    .25 .02  .057   .055   .051   .066      0      0      0
Ce       .5  .0127    .25 .02  .057   .055   .051   .066      0      0      0
O(1)  .3622  .1709    .25      .061   .097   .062   .023  -.047      0      0
O(2)  .1633  .3780    .25      .047   .048   .058   .035  -.000      0      0
O(3)  .3020  .3571 -.0398      .035   .026   .052   .027  -.015  -.003   .008
O(4)  .3758  .4471    .25      .026   .022   .042   .015  -.001      0      0
OH       .5  .6106  .0547      .033   .027   .051   .022      0      0   .003
Wat      .5   .126  -.022      .096    .12    .10   .075      0      0  -.001