American Mineralogist Crystal Structure Database

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Mountainite
Download hom/mountainite.pdf
Zubkova N V, Pekov I V, Pushcharovsky D Y, Chukanov N V
 
Zeitschrift fur Kristallographie 224 (2009) 389-396
The crystal structure and refined formula of mountainite, KNa2Ca2[Si8O19(OH)]*6H2O
Locality: Yubileinaya pegmatite, Lovozero alkaline complex, Kola Peninsula, Russia
_database_code_amcsd 0011131
13.704 6.5760 13.751 90 105.752 90 P2/c
atom       x     y      z occ  Uiso
K          0 .2758    .25     .0292
Na1    .4500 .8466  .5817  .5  .043
Na2    .4317 .7075  .4412  .5  .030
Ca    .01912 .2444 .56031     .0129
Si1   .33509 .2235 .64951     .0117
Si2    .2193 .4690  .7635     .0109
Si3    .2042 .1638  .1284     .0118
Si4    .2096 .5042  .9833     .0120
O1     .7958 .2940  .2696      .022
O2     .1192 .3437  .7139      .018
O3     .3196 .3818  .7349      .018
O4     .9034 .0768  .4265     .0225
O5     .2724 .2975  .5383      .020
O6     .2543 .4703  .8860      .016
O7     .7495 .3064  .4441      .017
O8     .2930 .0055  .6734      .021
O9     .4534 .2051  .6583  .5  .022
OH9    .4534 .2051  .6583  .5  .022
O10    .0909 .4634  .4603      .018
Wat11  .9094 .0837  .6512      .023
Wat12     .5  .685    .75      .075
Wat13  .4747  .573  .4691  .5  .038
Wat14  .3600  .050  .3973  .5  .042
Wat15  .5488  .938  .5680  .5  .055
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