Vermiculite
      Shirozu H, Bailey S W
      American Mineralogist 51 (1966) 1124-1143
      Crystal structure of a two-layer Mg-vermiculite
      _database_code_amcsd 0000150

      CELL PARAMETERS:    5.3490   9.2550  28.8900   90.000   97.120   90.000
      SPACE GROUP: C2/c      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   1419.171
      Density (g/cm3):      2.157
      MAX. ABS. INTENSITY / VOLUME**2:      46.99281114    
      RIR:      7.092
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                 6.17        100.00       14.3336    0   0   2         2
                18.57          1.40        4.7779    0   0   6         2
                19.18          1.35        4.6275    0   2   0         2
                19.28          1.91        4.6043    1   1   0         4
                19.43          2.88        4.5684    0   2   1         4
                19.86          4.13        4.4714    1   1   1         4
                20.49          2.53        4.3341   -1   1   3         4
                23.44          1.78        3.7947   -1   1   5         4
                24.72          2.53        3.6010    0   2   5         4
                24.85          2.72        3.5834    0   0   8         2
                26.09          1.52        3.4152    1   1   5         4
                31.20          4.76        2.8667    0   0  10         2
                33.80          1.33        2.6521   -1   3   2         4
                34.55          1.99        2.5957   -2   0   4         2
                34.59          3.68        2.5933    1   3   2         4
                35.14          1.51        2.5535    2   0   2         2
                35.16          2.90        2.5522   -1   3   4         4
                37.57          3.16        2.3940    2   0   4         2
                37.58          6.55        2.3932   -1   3   6         4
                43.54          1.31        2.0785    1   3   8         4
                44.96          1.45        2.0164   -1   3  10         4
                54.79          1.65        1.6754   -1   3  14         4
                59.92          2.27        1.5437   -3   3   2         4
                59.97          1.09        1.5425    0   6   0         2
                70.77          1.19        1.3314    1   3  18         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.