Cahnite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from single crystal data of R110095
      Prewitt C T, Buerger M J
      American Mineralogist 46 (1961) 1077-1085
      The crystal structure of cahnite, Ca2BAsO4(OH)4
      _database_code_amcsd 0000097

      CELL PARAMETERS:   7.1060  7.1060  6.1960   90.000   90.000   90.000
      SPACE GROUP: I-4       

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            As     0.00000   0.00000   0.00000     1.000     0.600
            B      0.00000   0.50000   0.25000     1.000     0.500
            Ca     0.00000   0.00000   0.50000     1.000     1.300
            Ca     0.00000   0.50000   0.75000     1.000     1.300
            O      0.17800   0.05400   0.16700     1.000     1.000
            O      0.16000   0.44400   0.11400     1.000     1.000

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  6 +/-  6 +/-  5
            MAX. ABS. INTENSITY / VOLUME**2:      31.21725677    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                17.65         24.07        5.0247    1   1   0
                19.00         27.62        4.6700    1   0   1
                25.06        100.00        3.5530    2   0   0
                28.82          1.81        3.0980    0   0   2
                31.64          4.28        2.8277    2   1   1
                31.64         16.16        2.8277    1   2   1
                34.00         58.32        2.6371    1   1   2
                35.74         14.03        2.5124    2   2   0
                38.56         17.89        2.3350    2   0   2
                40.13         10.39        2.2471    3   1   0
                40.78         10.14        2.2125    3   0   1
                45.75          4.85        1.9833    1   0   3
                46.54          6.58        1.9513    2   2   2
                48.47          8.04        1.8781    3   2   1
                48.47          1.31        1.8781    2   3   1
                50.15         27.17        1.8190    1   3   2
                50.15         21.62        1.8190    3   1   2
                51.44          7.62        1.7765    4   0   0
                52.87          1.39        1.7317    2   1   3
                52.87          1.43        1.7317    1   2   3
                54.81          1.39        1.6749    3   3   0
                55.33          2.64        1.6604    4   1   1
                55.33          1.64        1.6604    1   4   1
                58.05          4.40        1.5889    2   4   0
                58.05          4.35        1.5889    4   2   0
                59.37          2.56        1.5567    3   0   3
                60.03          2.45        1.5411    4   0   2
                62.77          2.69        1.4803    1   1   4
                63.10         10.77        1.4734    3   3   2
                65.46          3.83        1.4258    2   3   3
                65.77          6.84        1.4199    2   0   4
                66.09          2.86        1.4138    2   4   2
                67.17          2.75        1.3936    5   1   0
                67.63          2.45        1.3852    4   3   1
                67.63          1.02        1.3852    5   0   1
                71.27          1.19        1.3233    1   4   3
                71.56          7.84        1.3185    2   2   4
                73.36          1.54        1.2906    5   2   1
                74.38          1.75        1.2754    1   3   4
                74.68          3.91        1.2709    5   1   2
                74.68          5.12        1.2709    1   5   2
                75.72          2.12        1.2562    4   4   0
                81.22          2.37        1.1843    6   0   0
                82.65          4.00        1.1675    4   0   4
                85.65          3.01        1.1341    3   5   2
                85.65          3.04        1.1341    5   3   2
                86.65          2.21        1.1236    6   2   0
                86.65          2.75        1.1236    2   6   0
                88.06          2.98        1.1092    2   4   4
                88.06          4.14        1.1092    4   2   4
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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.