Grumantite
Yamnova N Y, Pushcharovsky D Y, Andrianov V I, Rastsvetaeva R K,
Khomyakov A P, Mikheeva M G
Soviet Physics Doklady 34 (1989) 284-286
A new type of silicon-oxygen group in the structure of grumantite
Na[Si2O4(OH)]*H2O
Locality: Lovozero massif, Kola Peninsula, Russia
_database_code_amcsd 0015617
15.979 18.25 7.169 90 90 90 Fdd2
atom     x     y     z Biso
Na   .1382 .2385 .8868 1.44
Si1  .1030 .2258 .3753  .56
Si2  .2241 .0907 .3719  .51
O1   .1691 .1618 .4289 1.06
O2   .1589 .0243 .3149  .81
O4   .0413 .1452 .9666  .90
O6   .0140 .1873 .3233  .78
Oh5  .1183 .0253 .9513 1.17
Ow3  .0079 .0843 .6276 1.49
H1    .015  .112   .72  1.5
H2    .010  .120   .54  1.5
H3    .095  .071   .97  1.5