Parakeldyshite
Pekov I V, Zubkova N V, Pushcharovsky D Y, Kolitsch U, Tillmanns E
Crystallography Reports 52 (2007) 1066-1071
Refined crystal structure of parakeldyshite and genetic crystal
chemistry of zirconium minerals with [Si2O7] diorthogroups
Locality: Alluaiv Mountain (Lovozero), Kola Peninsula, Russia
_database_code_amcsd 0018674
6.617 8.813 5.426 87.26 85.68 71.75 P-1
atom       x       y        z  occ   Uiso
Na1    .8769  .09573  -.25739 .819  .0209
H1     .8769  .09573  -.25739 .066  .0209
Na1'    .827   .0624   -.2682 .085  .0209
Na1"    .759    .004    -.274 .030  .0209
Na2   .34251  .50132   .23243      .01722
Zr   .289623 .270621 -.221466      .00530
Si1   .64397  .14776   .22433      .00560
Si2   .93730  .33444   .31565      .00551
O1    .29140  .03947  -.16584      .01355
O2    .87893  .16677   .27825      .01047
O3    .49007  .20905   .46593      .01444
O4    .56307  .25335  -.02375      .00894
O5    .00766  .31950   .59858      .00951
O6    .12482  .33736   .11279      .01042
O7    .27715  .51311  -.28980      .00902