Perkovaite
      Krivovichev S V, Shcherbakova E P, Nishanbaev T P
      The Canadian Mineralogist 48 (2010) 1469-1475
      The crystal structure of beta-CaMg2(SO4)3, a mineral phase from coal dumps
      of the Chelyabinsk coal basin, Russia
      Locality: coal dumps of the Chelyabinsk coal basin, Russia
      _database_code_amcsd 0018301

      CELL PARAMETERS:   16.5810  16.5810   7.3480   90.000   90.000  120.000
      SPACE GROUP: P6_3      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   1749.529
      Density (g/cm3):      3.013
      MAX. ABS. INTENSITY / VOLUME**2:      26.72948014    
      RIR:      2.888
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                 6.16         30.57       14.3596    1   0   0         6
                10.67          8.50        8.2905    1   1   0         6
                12.33          8.80        7.1798    2   0   0         6
                16.33          3.13        5.4274    1   2   0         6
                16.33          3.00        5.4274    2   1   0         6
                18.54          2.30        4.7865    3   0   0         6
                21.44         10.22        4.1452    2   2   0         6
                22.32          1.28        3.9826    1   3   0         6
                22.32          1.03        3.9826    3   1   0         6
                24.22          2.57        3.6740    0   0   2         1
                24.66        100.00        3.6104    2   2   1         6
                24.80          4.25        3.5899    4   0   0         6
                25.02          1.96        3.5593    1   0   2         6
                26.54          1.71        3.3589    1   1   2         6
                27.07          1.00        3.2943    2   3   0         6
                27.27          2.76        3.2707    2   0   2         6
                27.66          6.58        3.2255    4   0   1         6
                29.36          1.16        3.0425    1   2   2         6
                29.36          1.47        3.0425    2   1   2         6
                30.68          1.48        2.9144    3   0   2         6
                32.57         45.78        2.7495    2   2   2         6
                33.01         14.12        2.7137    4   2   0         6
                33.18          1.01        2.7004    1   3   2         6
                35.26          1.43        2.5456    2   4   1         6
                37.58         14.54        2.3933    6   0   0         6
                38.32          1.01        2.3490    1   1   3         6
                39.60          6.50        2.2756    6   0   1         6
                41.36          2.61        2.1828    2   4   2         6
                41.36          7.16        2.1828    4   2   2         6
                42.89          4.43        2.1087    2   2   3         6
                44.79          2.57        2.0233    4   0   3         6
                45.22          1.04        2.0053    6   0   2         6
                49.63          4.35        1.8370    0   0   4         1
                50.17          3.62        1.8182    2   4   3         6
                50.56         12.69        1.8052    4   4   2         6
                51.34          1.89        1.7797    2   0   4         6
                52.25          1.04        1.7507    2   6   2         6
                52.48          1.28        1.7437    8   0   1         6
                56.25          1.82        1.6353    4   0   4         6
                57.32          2.10        1.6073    6   4   1         6
                58.32          1.29        1.5822    4   4   3         6
                58.95          4.85        1.5668    2   8   0         6
                59.86          4.36        1.5451    6   2   3         6
                60.41          1.19        1.5323    2   8   1         6
                60.41          1.18        1.5323    8   2   1         6
                63.88          4.47        1.4572    6   0   4         6
                64.68          1.85        1.4412    2   8   2         6
                64.68          3.77        1.4412    8   2   2         6
                67.64          2.38        1.3851    2   2   5         6
                67.83          2.05        1.3817    6   6   0         6
                69.63          1.03        1.3502    6   2   4         6
                71.48          1.28        1.3198    8   2   3         6
                74.56          1.07        1.2728    8   4   2         6
                80.22          1.17        1.1966   12   0   0         6
                88.56          1.47        1.1042    6   6   4         6
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.