Penkvilksite
Merlino S, Pasero M, Artioli G, Khomyakov A P
American Mineralogist 79 (1994) 1185-1193
Penkvilksite, a new kind of silicate structure: OD character, X-ray
single-crystal (1M), and powder Rietveld (2O) refinements of two MDO polytypes
Note: polytype 1M
Data has been corrected according to the ICSD
_database_code_amcsd 0001689
8.956 8.727 7.387 90 112.74 90 P2_1/c
atom     x     y     z  Uiso
Ti       0    .5     0 .0072
Si1  .1598 .1599 .1981 .0081
Si2  .3138 .4423 .4067 .0082
Na   .1928 .6912 .7136 .0266
O1   .3136 .2621 .3462 .0124
O2   .1032 .0379 .3202 .0118
O3   .0207 .2781 .0677 .0119
O4   .2347 .0519 .0704 .0126
O5   .2091 .5387 .2153 .0109
O6      .5     0     0 .0142
OW   .3696 .6888 .0286 .0451
H1    .330  .605  .093   .17
H2    .488  .667  .066   .17