Dawsonite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from single crystal data of R120093
      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
      _database_code_amcsd 0005083

      CELL PARAMETERS:   6.7320 10.3900  5.5620   90.000   90.000   90.000
      SPACE GROUP: Imam      

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Na     0.25000   0.75000   0.25000     1.000     0.030
            Al     0.00000   0.50000   0.00000     1.000     0.030
            C      0.00000   0.25400   0.25000     1.000     0.030
            O      0.00000   0.13300   0.25000     1.000     0.030
            O      0.00000   0.31500   0.05200     1.000     0.030
            OH     0.18000   0.52500   0.25000     1.000     0.030

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  6 +/-  9 +/-  5
            MAX. ABS. INTENSITY / VOLUME**2:      15.59944116    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                15.69        100.00        5.6497    1   1   0
                18.09          1.54        4.9036    0   1   1
                26.48         13.13        3.3660    2   0   0
                26.96          4.38        3.3069    1   2   1
                28.99          4.44        3.0797    1   3   0
                32.19          4.09        2.7810    0   0   2
                32.26         58.26        2.7751    2   1   1
                34.53         15.96        2.5975    0   4   0
                35.99         13.38        2.4951    1   1   2
                36.65          1.11        2.4518    0   2   2
                40.61          2.06        2.2217    1   4   1
                40.75          2.91        2.2143    2   3   1
                42.15         18.15        2.1439    2   0   2
                43.86          2.50        2.0640    1   3   2
                44.03          1.39        2.0564    2   4   0
                45.69         14.83        1.9856    1   5   0
                45.78          1.35        1.9818    2   2   2
                46.66          7.72        1.9466    0   5   1
                49.97          2.10        1.8252    0   1   3
                52.87          1.30        1.7317    0   6   0
                53.18         18.88        1.7222    3   1   2
                54.27          3.99        1.6902    1   2   3
                54.45          2.73        1.6851    2   5   1
                54.52          7.68        1.6830    4   0   0
                55.58         14.77        1.6535    2   4   2
                56.99          2.62        1.6160    1   5   2
                57.43          1.60        1.6045    2   1   3
                57.57          1.25        1.6011    4   2   0
                59.26          1.01        1.5593    3   3   2
                60.09          3.93        1.5398    2   6   0
                60.75          1.93        1.5247    3   5   0
                63.26          3.12        1.4700    0   6   2
                66.16          1.42        1.4124    4   4   0
                67.34          4.49        1.3905    0   0   4
                67.50          4.18        1.3876    4   2   2
                69.63          1.58        1.3502    1   1   4
                69.82          1.71        1.3471    2   6   2
                70.43          4.42        1.3369    3   5   2
                70.53          1.76        1.3352    5   1   0
                70.78          2.08        1.3311    3   6   1
                73.71          1.12        1.2854    1   7   2
                74.10          2.00        1.2796    2   5   3
                74.93          1.93        1.2673    1   3   4
                76.00          1.48        1.2522    3   4   3
                77.93          2.25        1.2259    0   4   4
                85.20          1.88        1.1390    1   5   4
                85.94          1.66        1.1310    3   7   2
                86.04          1.96        1.1299    5   5   0
                88.26          3.85        1.1071    4   6   2
                89.44          1.18        1.0956    2   7   3
                89.63          1.30        1.0937    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.