Dawsonite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R050641
      Frueh A J, Golightly J P
      The Canadian Mineralogist 9 (1967) 51-56
      The crystal structure of dawsonite NaAl(CO3)(OH)2
      Locality: McGill University, Montreal, Quebec, Canada

      CELL PARAMETERS:   6.763725   10.42129   5.581645   90.00000   90.00000   90.00000
      SPACE GROUP: Imam
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                15.66        100.00        5.6735    1   1   0
                18.07          1.56        4.9203    0   1   1
                26.39         13.06        3.3819    2   0   0
                26.90          4.42        3.3188    1   2   1
                28.92          4.47        3.0901    1   3   0
                32.10          4.15        2.7908    0   0   2
                32.14         58.27        2.7870    2   1   1
                34.45         16.12        2.6053    0   4   0
                35.88         13.53        2.5042    1   1   2
                36.55          1.12        2.4602    0   2   2
                40.49          2.08        2.2289    1   4   1
                40.61          2.92        2.2228    2   3   1
                41.99         18.26        2.1525    2   0   2
                43.72          2.54        2.0711    1   3   2
                43.88          1.40        2.0639    2   4   0
                45.56         14.98        1.9918    1   5   0
                45.61          1.36        1.9895    2   2   2
                46.52          7.82        1.9526    0   5   1
                49.79          2.13        1.8316    0   1   3
                52.71          1.31        1.7369    0   6   0
                52.95         18.91        1.7295    3   1   2
                54.07          4.05        1.6962    1   2   3
                54.25          2.75        1.6910    2   5   1
                54.25          7.61        1.6909    4   0   0
                55.37         14.90        1.6594    2   4   2
                56.79          2.65        1.6213    1   5   2
                57.20          1.61        1.6106    2   1   3
                57.28          1.24        1.6084    4   2   0
                59.00          1.01        1.5656    3   3   2
                59.86          3.96        1.5450    2   6   0
                60.49          1.93        1.5305    3   5   0
                63.04          3.16        1.4746    0   6   2
                65.84          1.42        1.4184    4   4   0
                67.06          4.57        1.3954    0   0   4
                67.17          4.18        1.3935    4   2   2
                69.34          1.60        1.3550    1   1   4
                69.53          1.73        1.3517    2   6   2
                70.12          4.44        1.3419    3   5   2
                70.48          2.09        1.3359    3   6   1
                70.14          1.75        1.3415    5   1   0
                73.42          1.14        1.2895    1   7   2
                73.78          2.02        1.2840    2   5   3
                74.61          1.96        1.2718    1   3   4
                75.64          1.50        1.2570    3   4   3
                77.60          2.29        1.2301    0   4   4
                84.81          1.90        1.1429    1   5   4
                85.54          1.67        1.1350    3   7   2
                85.56          1.95        1.1347    5   5   0
                87.80          3.86        1.1114    4   6   2
                89.02          1.19        1.0993    2   7   3
                89.07          1.30        1.0988    6   1   1
                89.07          1.30        1.0988    6   1   1
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.