Montmorillonite
      Viani A, Gualtieri A, Artioli G
      American Mineralogist 87 (2002) 966-975
      The nature of disorder in montmorillonite by simulation of X-ray powder patterns
      Note: Structural simulation model
      _database_code_amcsd 0002868

      CELL PARAMETERS:    5.1800   8.9800  15.0000   90.000   90.000   90.000
      SPACE GROUP: P1        
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    697.746
      Density (g/cm3):      1.801
      MAX. ABS. INTENSITY / VOLUME**2:      103.9485592    
      RIR:     18.798
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                 5.89        100.00       15.0000    0   0   1         1
                17.74          2.93        5.0000    0   0   3         1
                19.77          2.29        4.4900    0   2   0         1
                20.65          1.28        4.3014    0  -2   1         1
                20.65          1.28        4.3014    0   2   1         1
                20.66          1.36        4.2988   -1  -1   1         1
                20.66          1.37        4.2988   -1   1   1         1
                23.10          1.71        3.8505   -1  -1   2         1
                23.10          1.71        3.8505   -1   1   2         1
                29.78          1.07        3.0000    0   0   5         1
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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.