Nikischerite
      Huminicki D M C, Hawthorne F C
      The Canadian Mineralogist 41 (2003) 79-82
      The crystal structure of nikischerite, NaFeAl3(SO4)2(OH)18(H2O)12,
      a mineral of the shigaite group
      _database_code_amcsd 0005826

      CELL PARAMETERS:    9.3470   9.3470  33.0000   90.000   90.000  120.000
      SPACE GROUP: R-3       
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   2496.831
      Density (g/cm3):      2.317
      MAX. ABS. INTENSITY / VOLUME**2:      34.28142029    
      RIR:      4.818
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                 8.04        100.00       11.0000    0   0   3         2
                12.18          1.65        7.2673    0   1   2         6
                15.34          1.17        5.7780    1   0   4         6
                16.12         30.12        5.5000    0   0   6         2
                17.34          1.52        5.1152    0   1   5         6
                18.99          1.26        4.6735    1   1   0         6
                20.65          7.10        4.3014    2  -1   3         6
                20.65          5.59        4.3014    1   1   3         6
                21.82          1.30        4.0738    1   0   7         6
                22.62          1.50        3.9308    2   0   2         6
                24.27         25.77        3.6667    0   0   9         2
                25.82          1.18        3.4503    2   0   5         6
                29.70          4.25        3.0082   -1   3   2         6
                31.00          1.49        2.8848    1   1   9         6
                31.18          1.04        2.8686    2   1   4         6
                32.25          1.69        2.7758   -1   3   5         6
                33.20          6.63        2.6982    3   0   0         6
                34.22         14.10        2.6206    0   3   3         6
                34.96          2.68        2.5664    2   1   7         6
                37.11         13.21        2.4224    0   3   6         6
                37.11          5.70        2.4224    3   0   6         6
                39.42          1.96        2.2857    2   2   3         6
                41.55         11.22        2.1732    0   3   9         6
                47.19         12.47        1.9260    0   3  12         6
                47.19          1.49        1.9260    3   0  12         6
                49.73          1.14        1.8333    0   0  18         2
                52.47          1.05        1.7441    5  -1   3         6
                52.47          1.24        1.7441    4   1   3         6
                53.76          3.23        1.7051    0   3  15         6
                53.76          4.53        1.7051    3   0  15         6
                59.32          4.18        1.5578    3   3   0         6
                59.97          2.44        1.5424    6  -3   3         6
                59.97          2.05        1.5424    3   3   3         6
                61.11          1.56        1.5164    0   3  18         6
                61.11          2.10        1.5164    3   0  18         6
                61.91          2.13        1.4989    6  -3   6         6
                61.91          2.41        1.4989    3   3   6         6
                69.18          1.39        1.3579    3   0  21         6
                72.08          1.43        1.3103    6   0   6         6
                75.02          1.13        1.2661    6   0   9         6
                77.99          1.61        1.2251    3   0  24         6
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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.