Shirokshinite
Pekov I V, Chukanov N V, Ferraris G, Ivaldi G, Pushcharovsky D Y, Zadov A E
European Journal of Mineralogy 15 (2003) 447-454
Shirokshinite, K(NaMg2)Si4O10F2, a new mica with octahedral Na from Khidiny massif,
Kola Peninsula: descriptive data and structural disorder
Locality: Khidiny massif, Kola Peninsula, Russia
_database_code_amcsd 0006989
5.269 9.092 10.197 90 100.12 90 C2/m
atom     x     y     z   occ Uiso
K        0   1/2     0    .9 .035
Na       0   1/2     0   .02 .035
NaM1     0     0   1/2  .307 .013
MgM1     0     0   1/2  .657 .013
FeM1     0     0   1/2   .03 .013
MnM1     0     0   1/2 .0033 .013
TiM1     0     0   1/2 .0033 .013
NaM2     0 .3338   1/2  .307 .019
MgM2     0 .3338   1/2  .657 .019
FeM2     0 .3338   1/2   .03 .019
MnM2     0 .3338   1/2 .0033 .019
TiM2     0 .3338   1/2 .0033 .019
Si   .0762 .1667 .2261  .995 .015
Al   .0762 .1667 .2261  .005 .015
O1    .048     0  .164       .024
O2    .308 .2471 .1636       .024
O3    .132 .1678 .3849       .019
F     .124   1/2 .3897       .039