Sugilite
      Diffraction data computed using the structure from the paper listed below,
      along with the cell parameters refined from the powder pattern
      Armbruster T, Oberhansli R
      American Mineralogist 73 (1988) 595-600
      Crystal chemistry of double-ring silicates: Structures of sugilite and
      brannockite
      Note: x-coordinate of Na has been corrected

      CELL PARAMETERS:   10.05346   10.05346   14.07696   90.00000   90.00000   120.0000
      SPACE GROUP: P6/mcc
      X-RAY WAVELENGTH:     1.541838
      MAX. ABS. INTENSITY / VOLUME**2:      10.46107395
               2-THETA      INTENSITY    D-SPACING   H   K   L
                10.10          7.57        8.7066    1   0   0
                12.51         17.35        7.0385    0   0   2
                16.13          2.11        5.4736    1   0   2
                20.33         96.96        4.3533    2   0   0
                21.66         58.91        4.0906    1   1   2
                23.96          8.62        3.7024    2   0   2
                25.23         26.30        3.5192    0   0   4
                27.02          4.56        3.2908    2   1   0
                27.26         13.49        3.2628    1   0   4
                27.77         82.20        3.2044    2   1   1
                29.90          4.68        2.9810    2   1   2
                30.73         10.53        2.9022    3   0   0
                30.94        100.00        2.8829    1   1   4
                32.64         16.67        2.7368    2   0   4
                33.17         11.53        2.6942    2   1   3
                33.32          4.54        2.6831    3   0   2
                35.64         27.11        2.5134    2   2   0
                37.15          4.70        2.4148    3   1   0
                37.33          2.22        2.4036    2   1   4
                37.72          3.50        2.3800    3   1   1
                39.37          1.78        2.2841    3   1   2
                39.71          1.33        2.2654    1   0   6
                40.19         12.23        2.2390    3   0   4
                42.00          8.85        2.1471    3   1   3
                42.43          1.56        2.1260    1   1   6
                43.43          1.74        2.0795    4   0   2
                44.20          3.38        2.0453    2   2   4
                45.31          6.60        1.9974    3   2   0
                45.47         15.14        1.9911    3   1   4
                47.21          1.60        1.9215    3   2   2
                47.78         10.22        1.8999    4   1   0
                48.25         14.70        1.8829    4   1   1
                49.51          1.35        1.8378    3   2   3
                49.61          4.76        1.8343    4   1   2
                49.65         13.10        1.8329    3   1   5
                49.89          5.30        1.8245    3   0   6
                51.82          1.21        1.7610    4   1   3
                51.87         11.06        1.7596    0   0   8
                52.46          1.04        1.7413    5   0   0
                53.29          1.99        1.7160    2   1   7
                53.32         12.04        1.7151    2   2   6
                54.82         13.26        1.6718    4   1   4
                56.30          6.23        1.6314    2   0   8
                56.35          1.31        1.6300    3   3   2
                58.51          1.65        1.5749    4   1   5
                59.37          9.13        1.5542    5   1   1
                59.43          1.37        1.5527    4   2   3
                61.16         16.05        1.5129    3   3   4
                61.53          5.18        1.5047    3   0   8
                62.51          2.03        1.4835    5   1   3
                64.07          1.74        1.4511    6   0   0
                64.55         14.08        1.4415    2   2   8
                65.18          1.55        1.4290    5   1   4
                65.44          3.75        1.4240    4   3   1
                65.59          4.22        1.4212    6   0   2
                66.03          1.96        1.4127    2   1   9
                67.03         13.52        1.3942    5   2   0
                67.40          4.88        1.3874    5   2   1
                67.75          2.83        1.3810    4   1   7
                68.51          1.17        1.3676    5   2   2
                68.54          4.42        1.3670    5   1   5
                69.20          2.59        1.3555    1   1  10
                70.03          3.34        1.3415    6   0   4
                70.34          2.19        1.3364    5   2   3
                70.87          2.58        1.3277    6   1   0
                71.33          3.44        1.3204    3   2   8
                71.80         10.73        1.3128    3   1   9
                72.54          1.09        1.3012    5   1   6
                73.00          1.82        1.2943    2   1  10
                73.21          2.60        1.2910    4   1   8
                74.22          3.10        1.2759    4   3   5
                76.48          1.31        1.2438    7   0   0
                79.22          2.30        1.2075    4   1   9
                79.63          1.68        1.2023    5   3   3
                79.93          1.83        1.1985    5   2   6
                80.40          1.04        1.1927    2   1  11
                81.16          1.17        1.1835    4   4   4
                82.07          1.12        1.1727    7   0   4
                84.44          1.26        1.1458    5   2   7
                84.74          2.79        1.1424    1   1  12
                85.80          1.75        1.1311    4   1  10
                88.25          3.89        1.1059    5   1   9
                89.27          1.04        1.0959    7   1   4
                89.27          1.04        1.0959    7   1   4
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.