Alunite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R050289
      Menchetti S, Sabelli C
      Neues Jahrbuch fur Mineralogie, Monatshefte 1976 (1976) 406-417
      Crystal chemistry of the alunite series: crystal structure refinement of alunite
      and synthetic jarosite
      Note: none of the reported bond lengths can be reproduced
      Locality: Montioni, Toscana, Italy

      CELL PARAMETERS:   6.960000   6.960000   17.35000   90.00000   90.00000   120.0000
      SPACE GROUP: R-3m
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                14.99          7.20        5.9195    1   0   1
                17.63         25.65        5.0371    0   1   2
                24.35         18.16        3.6578    1   1   0
                30.39          4.86        2.9420    0   1   5
                29.27        100.00        3.0519    1   1   3
                28.70         29.21        3.1117    0   2   1
                32.35          3.63        2.7683    0   0   6
                35.65          9.53        2.5186    0   2   4
                40.60         30.24        2.2221    1   0   7
                39.30          4.75        2.2925    2   0   5
                37.97          2.21        2.3701    2   1   1
                40.88          1.03        2.2074    1   1   6
                39.15          4.66        2.3009    1   2   2
                49.37          1.88        1.8455    0   0   9
                47.89          3.44        1.8991    0   2   7
                45.99         24.66        1.9732    0   3   3
                52.70          2.26        1.7365    2   0   8
                49.85         31.45        1.8289    2   2   0
                54.42          3.81        1.6855    2   1   7
                57.33          1.18        1.6067    1   0  10
                54.65          1.30        1.6790    0   3   6
                58.85          3.24        1.5687    1   2   8
                56.89          1.17        1.6182    1   3   4
                63.19         20.40        1.4710    0   2  10
                60.67          6.34        1.5260    2   2   6
                62.77          2.70        1.4799    4   0   4
                68.86          2.42        1.3630    2   0  11
                66.15          4.95        1.4121    1   3   7
                65.13          1.91        1.4317    2   3   2
                67.76          1.34        1.3825    4   1   0
                75.94          1.21        1.2525    1   0  13
                71.60          1.06        1.3174    4   0   7
                70.13          2.54        1.3413    1   4   3
                70.13          6.22        1.3413    4   1   3
                76.89          5.63        1.2394    3   2   7
                79.34          1.92        1.2071    1   3  10
                86.25          4.22        1.1272    2   1  13
                84.48          3.75        1.1463    4   0  10
                80.65          1.14        1.1907    3   3   3
                84.10          1.06        1.1504    2   4   4
                84.10          1.06        1.1504    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.