Barbertonite
      Mills S J, Whitfield P S, Wilson S A, Woodhouse J N, Dipple G M,
      Raudsepp M, Francis C A
      American Mineralogist 96 (2011) 179-187
      The crystal structure of stichtite, re-examination of barbertonite, and the
      nature of polytypism in MgCr hydrotalcites
      Note: Sample 84588, 2H1 polytype of stichtite
      Locality: Barberton, South Africa
      _database_code_amcsd 0018333

      CELL PARAMETERS:    3.0969   3.0969  15.6193   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    129.731
      Density (g/cm3):      2.177
      MAX. ABS. INTENSITY / VOLUME**2:      21.62623832    
      RIR:      3.235
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                11.33        100.00        7.8096    0   0   2         2
                22.77         37.33        3.9048    0   0   4         2
                33.91         24.83        2.6433    1   0   1        12
                34.45          1.01        2.6032    0   0   6         2
                35.39         22.25        2.5366    1   0   2        12
                37.73          4.25        2.3842    1   0   3        12
                40.82         13.91        2.2108    1   0   4        12
                44.52         17.95        2.0349    1   0   5        12
                46.51          1.19        1.9524    0   0   8         2
                48.75         25.70        1.8680    1   0   6        12
                58.47          8.30        1.5785    1   0   8        12
                59.72         11.94        1.5484    1   1   0         6
                61.00          8.86        1.5189    1   1   2        12
                64.77          4.91        1.4394    1   1   4        12
                69.66          6.06        1.3497    1   0  10        12
                71.37          2.43        1.3217    2   0   2        12
                72.64          1.19        1.3016    0   0  12         2
                72.83          1.05        1.2986    2   0   3        12
                74.87          1.52        1.2683    2   0   4        12
                75.81          2.36        1.2549    1   0  11        12
                80.58          4.08        1.1921    2   0   6        12
                88.44          1.75        1.1054    2   0   8        12
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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.