Crandallite
Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from single crystal data of R140429
      Blount A M
      American Mineralogist 59 (1974) 41-47
      The crystal structure of crandallite
      Locality: Clay Canyon, Fairfield, Utah, USA
      _database_code_amcsd 0000392

      CELL PARAMETERS:   6.9780  6.9780 16.1860   90.000   90.000  120.000
      SPACE GROUP: R-3m      

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Ca     0.04400   0.00000   0.00000     0.167     1.040
            P      0.00000   0.00000   0.31370     1.000     0.547
            Al     0.50000   0.00000   0.50000     1.000     0.428
            O      0.00000   0.00000   0.40760     1.000     0.870
            O      0.21420  -0.21420   0.94710     1.000     0.937
            O      0.12370  -0.12370   0.13530     1.000     0.554

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  5 +/-  5 +/- 14
            MAX. ABS. INTENSITY / VOLUME**2:      13.71525251    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                15.65         23.97        5.6614    1   0   1
                18.32         31.66        4.8421    0   1   2
                25.53         34.01        3.4890    1   1   0
                30.09         43.32        2.9703    0   2   1
                30.51        100.00        2.9298    1   1   3
                31.35          3.87        2.8536    0   1   5
                31.61          2.26        2.8307    2   0   2
                33.21         12.84        2.6977    0   0   6
                37.13          3.54        2.4211    0   2   4
                40.85          3.62        2.2089    2   0   5
                41.06         12.40        2.1982    1   2   2
                41.83         41.89        2.1596    1   0   7
                42.35          1.21        2.1341    1   1   6
                45.61          1.55        1.9891    2   1   4
                48.22         38.05        1.8871    0   3   3
                49.65          2.79        1.8363    0   2   7
                50.76          1.84        1.7984    0   0   9
                52.45         30.33        1.7445    2   2   0
                54.59          1.37        1.6812    2   0   8
                56.03          3.88        1.6412    3   1   2
                56.64          1.63        1.6250    2   1   7
                57.67          5.04        1.5986    1   1   9
                59.72          2.08        1.5485    1   3   4
                61.20          6.28        1.5145    1   2   8
                61.66          3.36        1.5042    4   0   1
                62.39          3.32        1.4884    3   1   5
                62.54          3.68        1.4851    0   4   2
                63.51          9.92        1.4649    2   2   6
                65.41         18.45        1.4268    0   2  10
                66.01          2.73        1.4154    4   0   4
                68.54          1.08        1.3690    0   4   5
                68.69          3.82        1.3665    2   3   2
                69.23          2.63        1.3571    1   3   7
                70.15          5.67        1.3416    0   3   9
                71.29          2.14        1.3229    2   0  11
                71.55          2.27        1.3187    4   1   0
                74.00          2.32        1.2810    1   4   3
                74.00          5.96        1.2810    4   1   3
                78.42          1.24        1.2195    1   0  13
                80.84          8.51        1.1890    3   2   7
                82.92          2.49        1.1643    1   3  10
                83.04          1.44        1.1630    3   3   0
                86.92          2.25        1.1208    3   0  12
                88.54          2.51        1.1044    4   0  10
                89.69          3.14        1.0932    2   1  13
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       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.