Vermiculite
      Hendricks S B, Jefferson M E
      American Mineralogist 23 (1938) 851-862
      Crystal structure of vermiculites and mixed vermiculite-chlorites
      _database_code_amcsd 0000019

      CELL PARAMETERS:    5.3300   9.1800  28.8500   90.000   93.250   90.000
      SPACE GROUP: Cc        
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   1409.343
      Density (g/cm3):      1.778
      MAX. ABS. INTENSITY / VOLUME**2:      118.3898382    
      RIR:     21.685
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                 6.14        100.00       14.4018    0   0   2         1
                12.29          1.36        7.2009    0   0   4         1
                19.28          1.35        4.6038    1   1   0         2
                20.31          1.19        4.3733    0   2   2         2
                24.73          1.33        3.6005    0   0   8         1
                31.05          1.12        2.8804    0   0  10         1
                34.55          1.19        2.5958    1   3   2         2
                35.29          1.04        2.5431   -2   0   4         1
                36.42          2.39        2.4667    1   3   4         2
                39.26          1.26        2.2945    1   3   6         2
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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.