Cronstedtite
      Hendricks S B
      American Mineralogist 24 (1939) 529-539
      Random structures of layer minerals as illustrated by cronstedtite
      (2FeO.Fe2O3.SiO2.2H2O). Possible iron content of kaolin
      _database_code_amcsd 0000022

      CELL PARAMETERS:    3.1600   3.1600  21.2500   90.000   90.000  120.000
      SPACE GROUP: R3        
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    183.765
      Density (g/cm3):      3.946
      MAX. ABS. INTENSITY / VOLUME**2:      37.45649756    
      RIR:      3.091
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                12.50         18.05        7.0833    0   0   3         1
                25.14        100.00        3.5417    0   0   6         1
                33.00         39.31        2.7142    1   0   1         3
                33.82          5.26        2.6501    0   1   2         3
                36.95         68.95        2.4328    1   0   4         3
                38.11          4.18        2.3611    0   0   9         1
                39.15         33.68        2.3009    0   1   5         3
                44.58          5.62        2.0326    1   0   7         3
                47.71          7.26        1.9060    0   1   8         3
                51.61          1.79        1.7708    0   0  12         1
                54.69         28.22        1.6784    1   0  10         3
                58.41         19.59        1.5800    1   1   0         3
                58.48         10.84        1.5782    0   1  11         3
                59.99          2.83        1.5421    2  -1   3         3
                59.99          2.83        1.5421    1   1   3         3
                64.59          6.75        1.4429    2  -1   6         3
                64.59          6.75        1.4429    1   1   6         3
                65.94          1.73        1.4167    0   0  15         1
                68.75          8.49        1.3655    0   2   1         3
                69.23          2.69        1.3571    2   0   2         3
                71.01          9.23        1.3274    0   1  14         3
                71.15          8.21        1.3251    0   2   4         3
                71.90          4.00        1.3131    2  -1   9         3
                71.90          4.00        1.3131    1   1   9         3
                72.58          7.85        1.3025    2   0   5         3
                76.34          2.52        1.2475    0   2   7         3
                80.36          3.86        1.1948    1   0  16         3
                84.15          5.19        1.1504    0   2  10         3
                87.33          3.69        1.1166    2   0  11         3
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.