Pekovite
      Pautov L A, Agakhanov A A, Sokolova E V, Hawthorne F C
      The Canadian Mineralogist 42 (2004) 107-119
      Maleevite, BaB2Si2O8, and pekovite, SrB2Si2O8, new mineral species from the
      Dara-i-Pioz alkaline massif, Northern Tajikistan: Description and crystal structure
      Locality: Dara-i-Pioz alkaline massif, Northern Tajikistan
      _database_code_amcsd 0005929

      CELL PARAMETERS:    8.1550   7.9190   8.9210   90.000   90.000   90.000
      SPACE GROUP: Pnma      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    576.113
      Density (g/cm3):      3.382
      MAX. ABS. INTENSITY / VOLUME**2:      14.20626540    
      RIR:      1.368
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                14.72         15.68        6.0191    1   0   1         4
                14.96         16.13        5.9223    0   1   1         4
                18.52         13.53        4.7920    1   1   1         8
                21.80          2.98        4.0775    2   0   0         2
                22.45          2.12        3.9595    0   2   0         2
                22.72          1.92        3.9134    1   0   2         4
                24.56        100.00        3.6252    2   1   0         4
                25.39         75.77        3.5084    1   1   2         8
                26.54          9.07        3.3585    2   1   1         8
                26.95         67.22        3.3079    1   2   1         8
                29.68         25.76        3.0095    2   0   2         4
                30.18         22.74        2.9611    0   2   2         4
                31.49          1.19        2.8406    2   2   0         4
                31.81          4.85        2.8132    2   1   2         8
                32.04         21.73        2.7937    1   0   3         4
                32.15         47.89        2.7839    0   1   3         4
                32.16         10.05        2.7833    1   2   2         8
                33.10         42.06        2.7067    2   2   1         8
                34.03          1.36        2.6346    1   1   3         8
                34.49          9.70        2.6003    3   0   1         4
                35.46         12.60        2.5312    0   3   1         4
                36.37         27.61        2.4705    3   1   1         8
                37.19         20.39        2.4174    1   3   1         8
                37.43          7.63        2.4026    2   0   3         4
                37.54          8.03        2.3960    2   2   2         8
                38.79          7.44        2.3212    3   0   2         4
                40.44          8.30        2.2302    0   0   4         2
                40.50          2.36        2.2275    3   1   2         8
                41.25         20.02        2.1884    1   3   2         8
                41.55         14.47        2.1735    3   2   1         8
                42.00          6.66        2.1513    1   0   4         4
                43.60          6.47        2.0760    1   1   4         8
                44.09         27.39        2.0540    2   2   3         8
                44.44          5.83        2.0387    4   0   0         2
                45.19          4.56        2.0064    3   0   3         4
                45.28         16.94        2.0025    3   2   2         8
                45.72         19.86        1.9845    2   3   2         8
                45.83         15.90        1.9798    0   4   0         2
                45.97          5.18        1.9744    4   1   0         4
                45.97         10.97        1.9741    0   3   3         4
                46.70          2.35        1.9449    3   1   3         8
                47.15          6.34        1.9277    4   1   1         8
                47.89          2.95        1.8996    2   1   4         8
                48.40          7.43        1.8806    1   4   1         8
                49.19         13.18        1.8524    3   3   1         8
                50.34          2.15        1.8126    4   2   0         4
                50.43          3.34        1.8095    0   4   2         4
                51.03          1.39        1.7897    3   2   3         8
                51.44          2.24        1.7763    4   2   1         8
                51.75          4.56        1.7666    1   4   2         8
                52.50          7.56        1.7431    3   3   2         8
                52.50         15.74        1.7430    1   0   5         4
                52.58          4.92        1.7406    0   1   5         4
                53.12          2.34        1.7242    3   0   4         4
                53.86          2.32        1.7022    1   1   5         8
                54.46          9.06        1.6847    3   1   4         8
                54.58          5.42        1.6815    4   0   3         4
                54.66          7.72        1.6792    4   2   2         8
                55.07          7.38        1.6676    1   3   4         8
                55.90          6.51        1.6448    4   1   3         8
                56.28          2.38        1.6346    2   0   5         4
                57.44          4.73        1.6044    5   0   1         4
                57.71          3.88        1.5973    3   3   3         8
                58.10          3.21        1.5878    4   3   1         8
                58.38         12.73        1.5808    3   2   4         8
                58.60          2.93        1.5752    3   4   1         8
                58.72          2.22        1.5725    5   1   1         8
                60.61          3.57        1.5279    2   4   3         8
                61.07          6.67        1.5173    4   3   2         8
                61.36          1.67        1.5109    2   2   5         8
                61.57          2.50        1.5063    3   4   2         8
                61.64          1.05        1.5048    4   0   4         4
                61.67          1.54        1.5039    5   1   2         8
                62.46          1.95        1.4870    5   2   1         8
                62.76          1.71        1.4806    0   4   4         4
                62.87          1.50        1.4782    0   3   5         4
                62.96         12.94        1.4763    2   5   0         4
                63.35          5.65        1.4681    1   5   2         8
                63.46          8.78        1.4658    3   1   5         8
                63.61          1.28        1.4627    1   0   6         4
                63.90          4.30        1.4568    1   4   4         8
                63.91          1.23        1.4565    2   5   1         8
                65.32          3.63        1.4286    5   2   2         8
                65.75          2.44        1.4203    4   4   0         4
                65.86          8.29        1.4182    4   3   3         8
                66.94          4.31        1.3979    0   5   3         4
                66.99          1.97        1.3969    2   0   6         4
                67.05          2.73        1.3958    3   2   5         8
                67.26          4.50        1.3919    0   2   6         4
                68.17          2.60        1.3756    2   1   6         8
                69.11          1.12        1.3592    6   0   0         2
                69.45          1.67        1.3533    4   4   2         8
                69.49          3.01        1.3526    3   5   1         8
                70.02          1.77        1.3437    6   0   1         4
                70.27          1.99        1.3396    6   1   0         4
                71.17          2.26        1.3249    5   3   2         8
                71.23          1.03        1.3238    4   1   5         8
                71.48          3.90        1.3198    0   6   0         2
                71.69          2.58        1.3165    5   0   4         4
                72.21          2.41        1.3082    1   4   5         8
                72.73          1.48        1.3002    3   4   4         8
                72.83          3.68        1.2987    5   1   4         8
                73.87          1.49        1.2830    6   1   2         8
                73.96          2.39        1.2816    4   4   3         8
                75.41          1.72        1.2605    2   4   5         8
                75.63          2.50        1.2574    5   3   3         8
                76.10          1.95        1.2507    4   5   0         4
                76.41          4.06        1.2465    5   4   1         8
                76.65          1.73        1.2431    3   5   3         8
                77.16          1.20        1.2362    6   0   3         4
                77.23          1.54        1.2353    6   2   2         8
                77.28          7.06        1.2346    2   3   6         8
                77.54          1.19        1.2311    2   5   4         8
                79.28          3.54        1.2084    6   3   0         4
                79.64          2.39        1.2038    5   0   5         4
                79.95          5.61        1.1999    1   2   7         8
                80.48          2.04        1.1934    1   6   3         8
                80.85          1.80        1.1889    0   4   6         4
                81.21          1.57        1.1845    0   5   5         4
                81.59          3.83        1.1800    6   2   3         8
                81.74          2.12        1.1781    5   3   4         8
                81.84          1.77        1.1769    3   6   1         8
                82.25          1.17        1.1722    1   5   5         8
                82.74          3.91        1.1664    3   5   4         8
                83.58          3.94        1.1568    2   6   3         8
                83.93          1.49        1.1529    4   5   3         8
                84.23          5.57        1.1496    4   2   6         8
                84.43          3.37        1.1473    3   6   2         8
                84.82          2.30        1.1431    7   1   1         8
                84.93          1.72        1.1418    3   1   7         8
                85.43          2.71        1.1365    1   3   7         8
                86.31          1.55        1.1271    5   5   1         8
                86.77          1.54        1.1223    0   7   1         4
                87.47          2.27        1.1151    0   0   8         2
                88.20          1.83        1.1078    3   2   7         8
                89.47          1.39        1.0953    5   3   5         8
                89.67          2.92        1.0934    4   3   6         8
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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.