Alunite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R060873
      Hendricks S B
      American Mineralogist 22 (1937) 773-784
      The crystal structures of alunite and the jarosites

      CELL PARAMETERS:   7.011838   7.011838   17.82551   90.00000   90.00000   120.0000
      SPACE GROUP: R-3m
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                15.50          7.20        5.7481    1   0   1
                17.75         25.65        5.0184    0   1   2
                25.48         18.16        3.5059    1   1   0
                29.12          4.86        3.0744    0   1   5
                29.66        100.00        3.0195    1   1   3
                29.92         29.21        2.9931    0   2   1
                30.15          3.63        2.9709    0   0   6
                35.85          9.53        2.5092    0   2   4
                38.39         30.24        2.3484    1   0   7
                39.03          4.75        2.3115    2   0   5
                39.65          2.21        2.2764    2   1   1
                39.83          1.03        2.2666    1   1   6
                40.65          4.66        2.2226    1   2   2
                45.87          1.88        1.9806    0   0   9
                46.60          3.44        1.9511    0   2   7
                47.51         24.66        1.9160    0   3   3
                50.88          2.26        1.7964    2   0   8
                52.23         31.45        1.7530    2   2   0
                53.82          3.81        1.7049    2   1   7
                53.63          1.18        1.7104    1   0  10
                54.93          1.30        1.6728    0   3   6
                57.70          3.24        1.5987    1   2   8
                58.64          1.17        1.5754    1   3   4
                60.24         20.40        1.5372    0   2  10
                61.45          6.34        1.5097    2   2   6
                64.92          2.70        1.4370    4   0   4
                65.30          2.42        1.4296    2   0  11
                66.60          4.95        1.4048    1   3   7
                68.16          1.91        1.3764    2   3   2
                71.18          1.34        1.3251    4   1   0
                70.42          1.21        1.3375    1   0  13
                72.51          1.06        1.3040    4   0   7
                73.20          2.54        1.2933    1   4   3
                73.20          6.22        1.2933    4   1   3
                78.23          5.63        1.2222    3   2   7
                78.08          1.92        1.2242    1   3  10
                81.84          4.22        1.1771    2   1  13
                83.69          3.75        1.1558    4   0  10
                84.50          1.14        1.1467    3   3   3
                87.85          1.06        1.1113    2   4   4
                87.85          1.06        1.1113    2   4   4
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.