Gillespite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern R060060
      Miletich R, Allan D R, Angel R J
      American Mineralogist 82 (1997) 697-707
      The synthetic Cr2+ silicates BaCrSi4O10 and SrCrSi4O10: The missing links in
      the gillespite-type ABSi4O10 series
      BaCrSi4O10

      CELL PARAMETERS:   7.531400   7.531400   16.05180   90.00000   90.00000   90.00000
      ALTERNATE SETTING FOR SPACE GROUP: P4/ncc
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                11.03         37.87        8.0407    0   0   2
                16.71         13.49        5.3153    1   1   0
                20.05         53.40        4.4340    1   1   2
                22.13          5.18        4.0203    0   0   4
                25.14         23.59        3.5451    1   0   4
                26.19        100.00        3.4048    2   0   2
                27.12          7.24        3.2905    2   1   1
                27.84         64.93        3.2064    1   1   4
                28.80         29.45        3.1015    2   1   2
                32.63         33.92        2.7455    2   0   4
                33.44          4.07        2.6802    0   0   6
                33.74         34.60        2.6576    2   2   0
                35.59         12.85        2.5234    2   2   2
                37.61          2.57        2.3922    3   0   2
                37.59         28.43        2.3932    1   1   6
                37.86          9.30        2.3771    3   1   0
                38.28          1.26        2.3515    3   1   1
                39.54         18.65        2.2795    3   1   2
                40.70          8.77        2.2170    2   2   4
                41.38          2.09        2.1822    2   0   6
                43.17          2.83        2.0957    2   1   6
                43.79          2.14        2.0675    3   2   1
                44.27         21.50        2.0462    3   1   4
                44.92          1.55        2.0181    3   2   2
                45.10          4.88        2.0102    0   0   8
                46.78          6.32        1.9419    1   0   8
                47.57          1.51        1.9116    3   1   5
                48.22          3.18        1.8872    2   2   6
                48.44         17.28        1.8792    4   0   0
                48.41          7.13        1.8802    1   1   8
                49.23          6.69        1.8508    3   2   4
                49.83          3.93        1.8299    4   0   2
                50.37          2.06        1.8115    4   1   1
                51.37         21.51        1.7784    3   1   6
                51.55          2.98        1.7726    2   0   8
                52.91          3.33        1.7302    3   3   2
                54.59          6.31        1.6808    4   2   0
                55.32          2.20        1.6604    4   1   4
                55.87         16.76        1.6453    4   2   2
                56.77          9.87        1.6213    3   3   4
                57.47          2.65        1.6032    2   2   8
                59.61          2.88        1.5508    4   2   4
                60.12          3.07        1.5387    4   0   6
                60.10          1.40        1.5392    1   1  10
                60.28          6.45        1.5349    3   1   8
                61.98          1.52        1.4969    4   3   1
                62.87          1.22        1.4778    4   3   2
                62.86          3.92        1.4780    3   3   6
                62.84         10.86        1.4785    2   0  10
                64.22          3.56        1.4500    5   1   2
                64.36          4.47        1.4471    3   2   8
                65.67          1.49        1.4214    5   1   3
                66.37          1.48        1.4081    5   0   4
                67.67          8.65        1.3841    5   1   4
                68.16          3.88        1.3753    5   2   2
                68.13          1.66        1.3759    2   2  10
                68.31          3.77        1.3728    4   0   8
                69.60          1.77        1.3504    4   1   8
                70.21          1.93        1.3401    0   0  12
                70.90          1.79        1.3288    4   4   0
                70.70          1.37        1.3320    3   1  10
                70.87          2.06        1.3292    3   3   8
                72.01          1.42        1.3110    4   4   2
                73.26          4.90        1.2917    5   1   6
                73.42          1.63        1.2891    5   3   0
                73.40          2.12        1.2895    4   2   8
                74.52          1.88        1.2729    5   3   2
                75.92          1.04        1.2528    6   0   0
                76.79          1.40        1.2407    5   1   7
                77.00          1.98        1.2379    6   0   2
                77.77          1.91        1.2276    5   3   4
                79.60          1.57        1.2039    5   0   8
                80.18          4.58        1.1966    2   2  12
                80.84          1.17        1.1885    6   2   0
                80.82          2.39        1.1888    5   1   8
                81.90          2.73        1.1758    6   2   2
                82.62          1.39        1.1674    3   1  12
                83.10          5.64        1.1617    5   3   6
                83.08          6.03        1.1620    4   2  10
                85.08          2.55        1.1398    6   2   4
                88.08          1.40        1.1085    4   4   8
                89.86          1.66        1.0911    4   0  12
                89.86          1.66        1.0911    4   0  12
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.