Ivanyukite-Na Yakovenchuk V N, Nikolaev A P, Selivanova E A, Pakhomovsky Y A, Korchak J A, Spiridonova D V, Zalkind O A, Krivovichev S V American Mineralogist 94 (2009) 1450-1458 Ivanyukite-Na-T, ivanyukite-Na-C, ivanyukite-K, and ivanyukite-Cu: New microporous titanosilicates from the Khibiny massif (Kola Peninsula, Russia) and crystal structure of ivanyukite-Na-T Locality: Koashva Mountain, Khibiny Massif, Kola Peninsula, Russia Note: trigonal polytype, Ivanyukite-Na-T _database_code_amcsd 0004993 10.921 10.921 13.885 90 90 120 R3m atom x y z occ Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Ti1 .4793 .2397 .3529 .026 .025 .0233 .029 .0126 .0023 .0011 Ti2 2/3 1/3 .1747 .033 .027 .027 .045 .0134 .000 .000 Si .3323 .1661 .1461 .031 .027 .026 .041 .0134 -.014 -.0068 K 2/3 1/3 .6181 .52 .038 Na .1974 .3949 .2062 .48 .029 O1 .3317 .1658 .2665 .037 .012 .044 .045 .006 -.012 -.006 O2 .2616 .0061 .1036 .033 .034 .026 .035 .013 -.007 -.004 O3 .4934 .2467 .1031 .030 .027 .020 .045 .013 -.024 -.012 O4 2/3 1/3 .426 .030 .027 .027 .036 .013 .000 .000 O5 .5900 .4100 .2750 .038 .039 .039 .041 .023 -.002 .002 Wat6 .140 .280 .352 .092 Wat7 .098 .5491 .238 .072