Trona
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R050499
      Choi C S, Mighell A D
      Acta Crystallographica B38 (1982) 2874-2876
      Neutron diffraction study of sodium sesquicarbonate dihydrate
      Note: H3 disordered model, this is the prefered model

      CELL PARAMETERS:   20.41901   3.492738   10.33141   90.00000   106.4248   90.00000
      SPACE GROUP: C2/c
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                 9.08         26.42        9.7929    2   0   0
                17.94          2.73        4.9549    0   0   2
                18.16         16.16        4.8964    4   0   0
                22.32          4.79        3.9900    2   0   2
                25.95          2.18        3.4385    1   1   0
                27.35          1.59        3.2643    6   0   0
                27.91         24.12        3.1997    1   1   1
                28.20          1.47        3.1684   -6   0   2
                29.02          6.84        3.0797    3   1   0
                29.07         43.53        3.0751    4   0   2
                29.23         27.16        3.0589   -3   1   1
                32.14          5.02        2.7876   -3   1   2
                32.45         15.55        2.7614    1   1   2
                33.90        100.00        2.6467   -5   1   1
                34.43          1.42        2.6069    5   1   0
                34.77          6.72        2.5816   -2   0   4
                35.72          1.71        2.5156   -4   0   4
                35.80         11.35        2.5099   -5   1   2
                36.37          4.12        2.4720    3   1   2
                36.81         33.07        2.4435   -1   1   3
                37.04          3.72        2.4286    6   0   2
                37.19          7.21        2.4193   -3   1   3
                40.00         23.93        2.2550    2   0   4
                41.36          1.88        2.1840   -7   1   2
                42.11          4.30        2.1466    5   1   2
                42.75          2.10        2.1162    3   1   3
                44.06          4.28        2.0562   -8   0   4
                44.41         15.46        2.0405   -7   1   3
                44.70         17.34        2.0280  -10   0   2
                45.48          5.61        1.9950    4   0   4
                45.53          2.51        1.9929   -5   1   4
                46.23          9.15        1.9643    1   1   4
                46.37          2.04        1.9586   10   0   0
                48.29          5.80        1.8851   -9   1   2
                49.16          1.37        1.8536   -7   1   4
                49.35          1.51        1.8470    9   1   0
                51.40         13.01        1.7781   -3   1   5
                52.40          6.00        1.7464    0   2   0
                52.48          1.02        1.7438   -5   1   5
                52.54         13.72        1.7420    9   1   1
                53.29          1.14        1.7192    2   2   0
                53.29          2.66        1.7191   -4   0   6
                54.37          1.55        1.6875   -9   1   4
                54.64          4.83        1.6800    2   2   1
                55.08          1.05        1.6674   10   0   2
                55.30          2.48        1.6614   -7   1   5
                55.32         12.24        1.6608    7   1   3
                55.65          1.53        1.6516    0   0   6
                55.72          1.51        1.6498   -2   2   2
                55.78          3.50        1.6482   -4   2   1
                55.82          1.19        1.6471    0   2   2
                57.68          5.64        1.5983    4   2   1
                57.85          6.37        1.5940   -8   0   6
                58.24          1.98        1.5842  -12   0   4
                59.36          1.73        1.5570   -2   2   3
                59.51          1.13        1.5534   -6   2   1
                61.02          4.51        1.5186    4   2   2
                62.23          1.43        1.4917    6   2   1
                66.10          1.58        1.4134  -13   1   3
                66.23          2.04        1.4111   11   1   2
                66.87          3.72        1.3990   14   0   0
                67.87          2.05        1.3807    2   2   4
                68.43          1.30        1.3708  -12   0   6
                69.24          1.67        1.3568   -3   1   7
                69.30          1.66        1.3557   -5   1   7
                70.72          1.59        1.3319   -2   2   5
                70.87          1.21        1.3294    6   2   3
                70.84          2.50        1.3300    6   0   6
                71.25          1.18        1.3233  -10   2   2
                72.44          1.04        1.3044  -13   1   5
                74.87          1.41        1.2679    2   2   5
                76.40          1.03        1.2463  -16   0   4
                82.12          1.11        1.1733  -12   2   4
                85.99          1.73        1.1301  -12   2   5
                87.98          1.32        1.1096   11   1   5
                87.98          1.32        1.1096   11   1   5
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.