Leucite
      Palmer D C, Dove M T, Ibberson R M, Powell B M
      American Mineralogist 82 (1997) 16-29
      Structural behavior, crystal chemistry and phase transitions in substituted
      leucites: High-resolution neutron powder diffraction studies
      Sample: Natural, Expt. no. 3003, T = 298 K, KAlSi2O6
      _database_code_amcsd 0001851

      CELL PARAMETERS:   13.0548  13.0548  13.7518   90.000   90.000   90.000
      SPACE GROUP: I4_1/a    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   2343.678
      Density (g/cm3):      2.474
      MAX. ABS. INTENSITY / VOLUME**2:      10.72894210    
      RIR:      1.412
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                 9.34          5.99        9.4679    1   0   1         8
                13.57          2.57        6.5274    2   0   0         4
                16.07         13.71        5.5143    1   1   2         8
                16.50         14.31        5.3740    2   1   1         8
                16.50         29.36        5.3740    1   2   1         8
                18.74          7.18        4.7340    2   0   2         8
                19.23          1.18        4.6156    2   2   0         4
                20.54          1.63        4.3251    1   0   3         8
                24.69          7.81        3.6054    1   2   3         8
                25.16          3.82        3.5393    3   1   2         8
                25.16          2.63        3.5393    1   3   2         8
                25.44          8.57        3.5014    3   2   1         8
                25.44          2.45        3.5014    2   3   1         8
                25.92         72.26        3.4380    0   0   4         2
                27.33        100.00        3.2637    4   0   0         4
                28.28          3.28        3.1560    3   0   3         8
                28.94          1.88        3.0855    4   1   1         8
                28.94          2.95        3.0855    1   4   1         8
                29.36          3.53        3.0418    2   0   4         8
                30.31          3.17        2.9484    4   0   2         8
                30.63          2.89        2.9191    2   4   0         4
                30.63         27.12        2.9191    4   2   0         4
                31.49         24.09        2.8413    3   2   3         8
                31.49         11.88        2.8413    2   3   3         8
                31.86         23.00        2.8086    3   3   2         8
                33.35          1.24        2.6870    2   4   2         8
                33.93          8.34        2.6418    3   1   4         8
                33.93          2.54        2.6418    1   3   4         8
                34.43          1.66        2.6052    1   4   3         8
                36.10          1.40        2.4881    2   1   5         8
                37.48          1.23        2.3993    5   1   2         8
                37.68          1.79        2.3874    5   2   1         8
                38.02         23.30        2.3670    4   0   4         8
                38.73          2.64        2.3249    3   0   5         8
                39.03          4.66        2.3078    4   4   0         4
                39.30          2.29        2.2928    3   3   4         8
                39.73          1.08        2.2687    5   0   3         8
                41.22          1.72        2.1901    3   2   5         8
                41.77          4.53        2.1625    2   0   6         8
                42.17          2.28        2.1430    5   2   3         8
                42.46          9.26        2.1289    3   5   2         8
                43.86          2.98        2.0641    2   6   0         4
                44.10          1.00        2.0534    1   5   4         8
                44.95          1.37        2.0168    5   4   1         8
                46.73          1.66        1.9437    1   6   3         8
                47.17          1.68        1.9269    3   6   1         8
                47.45          3.15        1.9161    4   4   4         8
                48.54          2.48        1.8757    4   0   6         8
                48.89          2.17        1.8629    4   5   3         8
                48.92          1.35        1.8620    1   2   7         8
                49.59          3.41        1.8381    3   3   6         8
                50.41          2.32        1.8104    4   6   0         4
                50.64          1.13        1.8027    2   4   6         8
                50.98          1.63        1.7913    3   6   3         8
                50.98          1.44        1.7913    6   3   3         8
                51.23          1.59        1.7831    5   5   2         8
                51.23          1.47        1.7831    7   1   2         8
                51.39          1.75        1.7782    7   2   1         8
                53.01          1.95        1.7275    7   0   3         8
                53.03          2.96        1.7267    3   2   7         8
                53.03          2.98        1.7267    2   3   7         8
                53.29          1.83        1.7190    0   0   8         2
                54.99          3.05        1.6700    7   2   3         8
                55.01          2.62        1.6693    1   4   7         8
                55.23          1.47        1.6633    7   3   2         8
                55.23         10.18        1.6633    3   7   2         8
                55.26          1.39        1.6623    2   0   8         8
                56.38          1.43        1.6318    8   0   0         4
                56.58          3.24        1.6265    7   1   4         8
                56.60          1.15        1.6262    4   4   6         8
                57.29          1.20        1.6081    8   1   1         8
                57.55          1.52        1.6016    3   5   6         8
                58.13          1.72        1.5869    3   1   8         8
                58.28          3.59        1.5831    8   2   0         4
                60.34          2.01        1.5341    7   3   4         8
                60.35          1.27        1.5338    6   2   6         8
                60.65          1.21        1.5268    7   4   3         8
                60.91          1.19        1.5209    4   0   8         8
                62.69          2.18        1.4819    7   5   2         8
                62.69          1.52        1.4819    5   7   2         8
                62.87          1.84        1.4782    1   2   9         8
                63.06          1.41        1.4742    8   0   4         8
                64.61          1.36        1.4425    9   0   1         8
                66.37          1.14        1.4085    7   6   1         8
                67.76          1.64        1.3829    9   0   3         8
                67.78          1.28        1.3826    6   3   7         8
                68.10          1.40        1.3768    8   5   1         8
                68.33          4.15        1.3727    3   7   6         8
                69.05          3.16        1.3602    1   1  10         8
                69.48          1.70        1.3529    7   6   3         8
                71.17          1.03        1.3248    5   8   3         8
                71.51          1.06        1.3194    9   4   1         8
                72.44          2.77        1.3047    3   1  10         8
                72.57          1.40        1.3026    8   2   6         8
                73.06          1.06        1.2951    7   7   2         8
                73.18          2.55        1.2932    1  10   1         8
                74.52          2.03        1.2733    4   9   3         8
                75.58          1.51        1.2581    7   1   8         8
                76.17          1.63        1.2498    1  10   3         8
                76.19          2.19        1.2495    1   8   7         8
                76.50          1.04        1.2453   10   3   1         8
                78.14          1.07        1.2232    8   7   1         8
                79.04          1.70        1.2115    5   1  10         8
                79.46          1.19        1.2061    8   3   7         8
                82.28          2.79        1.1718    3   5  10         8
                84.31          1.14        1.1487    6   7   7         8
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.