Tumchaite
Subbotin V V, Merlino S, Pushcharovsky D Y, Pakhomovsky Y A, Ferro O,
Bogdanova A N, Voloshin A V, Sorokhtina N V, Zubkova N V
American Mineralogist 85 (2000) 1516-1520
Tumchaite Na2(Zr,Sn)Si4O11.2H2O - a new mineral from carbonatites of the
Vuoriyarvi alkali-ultrabasic massif, Murmansk Region, Russia
_database_code_amcsd 0002590
9.144 8.818 7.537 90 113.22 90 P2_1/c
atom     x     y     z occ  Uiso
Zr       0    .5     0  .8 .0076
Sn       0    .5     0  .2 .0076
Si1  .1669 .1582 .1993     .0093
Si2  .3176 .4421 .4124     .0093
Na   .2051 .6884 .7109     .0243
O1   .3148 .2659 .3454     .0129
O2   .1164 .0346 .3187     .0126
O3   .0260 .2676 .0660     .0131
O4   .2471 .0543 .0791     .0131
O5   .2145 .5425 .2299     .0120
O6      .5     0     0     .0157
OW   .3709 .6921 .0371     .0317
H1    .498  .684  .075       .05
H2    .352  .602  .090       .05