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