American Mineralogist Crystal Structure Database

1 matching records for this search.

Windhoekite
 
Chukanov N V, Britvin S N, Blass G, Belakovskiy D I, Van K V
 
European Journal of Mineralogy 24 (2012) 171-179
Windhoekite, Ca2Fe3+3-x(Si8O20)(OH)4*10H2O, a new palygorskite-group mineral
from the Aris phonolite, Namibia
Note: the chemical formula for this mineral cannot be obtained from the
crystal structure. The structure is missing two oxygens, and
the OH positions were not given.
Locality: Aris phonolite, Namibia
_database_code_amcsd 0018919
14.319 17.825 5.242 90 103.5 90 C2/m
atom       x     y     z occ  Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
CaM3      .5 .3130     0 .62  .057   .063   .067   .043      0   .019      0
Mn2+M3    .5 .3130     0 .04  .057   .063   .067   .043      0   .019      0
CaM4      .5 .2300    .5 .37  .053   .065   .045   .050      0   .016      0
Mn2+M4    .5 .2300    .5 .03  .053   .065   .045   .050      0   .016      0
Fe3+M1    .5    .5     0     .0294   .050   .024   .018      0   .015      0
Fe3+M2    .5 .4126    .5 .88 .0301   .051   .023   .022      0   .019      0
Si1    .3001 .4162 .0314     .0222   .045   .010   .016 -.0034   .015 -.0011
Si2    .2987 .3313 .5262     .0272   .053   .010   .024 -.0030   .020 -.0001
O1     .4180 .4167 .1144      .026   .044   .012   .025  -.007   .016  -.002
O2     .4154 .3308 .5910      .036   .052   .023   .037  -.001   .017  -.003
O3       .25   .25    .5      .041   .092   .009   .029  -.017   .026   .005
O4     .5685    .5 .3644      .033   .043   .033   .033      0   .028      0
O5     .2576    .5 .0015      .031   .057   .008   .031      0   .019      0
O6     .2566 .3735 .2495      .031   .061   .018   .019  -.001   .022   .006
O7     .2598 .3745  .755      .032   .057   .009   .035  -.009   .023  -.006
Wat1    .106    .5  .361       .26    .27    .27    .33      0    .24      0
Wat2   .4064 .2302  .107      .132    .17    .12    .13   .019   .083   -.01
Wat3    .487  .106  .698       .87
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