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

      CELL PARAMETERS:   10.9210  10.9210  13.8850   90.000   90.000  120.000
      SPACE GROUP: R3m       
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   1434.172
      Density (g/cm3):      2.453
      MAX. ABS. INTENSITY / VOLUME**2:      32.80268344    
      RIR:      4.355
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                11.32        100.00        7.8168    1   0   1         3
                15.84          3.81        5.5966    0   1   2         3
                16.23          1.85        5.4605    1   1   0         6
                19.18          1.22        4.6283    0   0   3         1
                19.83          5.12        4.4764    0   2   1         3
                22.75          3.11        3.9084    2   0   2         3
                25.73          1.20        3.4618    2   1   1         6
                27.37          8.54        3.2587    1   0   4         3
                28.08         15.81        3.1782    1   2   2         6
                28.31         11.56        3.1526    3   0   0         3
                31.98          4.17        2.7983    0   2   4         3
                32.80          6.38        2.7302    2   2   0         6
                34.42          1.06        2.6056    0   3   3         3
                34.42          8.52        2.6056    3   0   3         3
                36.07          4.17        2.4903    2   1   4         6
                36.62          6.72        2.4538    3   1   2         6
                37.56          7.12        2.3946    2   0   5         3
                38.27          4.05        2.3516    2   2   3         6
                38.63          1.69        2.3309    4   0   1         3
                46.47          5.76        1.9542    4   0   4         3
                47.69          4.06        1.9069    3   1   5         6
                48.28          1.59        1.8850    4   1   3         6
                49.54          3.38        1.8399    3   2   4         6
                49.97          1.29        1.8250    5   0   2         3
                50.12          2.11        1.8202    3   3   0         6
                52.90          1.16        1.7309    4   2   2         6
                58.04          1.14        1.5891    2   4   4         6
                58.32          3.37        1.5821    1   3   7         6
                59.86          2.55        1.5452    4   3   1         6
                66.87          2.45        1.3991    0   4   8         3
                68.77          2.34        1.3651    4   4   0         6
                69.96          1.10        1.3448    3   5   1         6
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       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.