Vlasovite
Fleet S G, Cann J R
Mineralogical Magazine 36 (1967) 233-241
Vlasovite: a second occurrence and a triclinic to monoclinic inversion
_database_code_amcsd 0014445
10.96 10.01 8.53 90 100.4 90 C2/c
atom     x     y     z Biso
Na1      0 .0733   .75  3.0
Na2      0 .4002   .75  3.0
Zr     .25   .25     0  1.0
Si1  .2653 .0724 .6381   .8
Si2  .0484 .2158 .4282   .8
O1       0 .1651   .25  1.2
O2   .1463 .1035 .5068  1.2
O3   .1166 .3586  .414  1.2
O4   .0574 .2412 .9682  1.2
O5   .2425 .1336 .7979  1.2
O6   .2941 .0852 .1546  1.2