Strontianite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R050564
      de Villiers J P R
      American Mineralogist 56 (1971) 758-767
      Crystal structures of aragonite, strontianite, and witherite

      CELL PARAMETERS:   5.082701   8.329651   5.985528   90.00000   90.00000   90.00000
      SPACE GROUP: Pmcn
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                20.46          4.45        4.3387    1   1   0
                21.32          1.86        4.1648    0   2   0
                25.34        100.00        3.5129    1   1   1
                26.05         52.61        3.4187    0   2   1
                29.83         12.16        2.9928    0   0   2
                31.52          1.98        2.8367    1   2   1
                31.75          9.90        2.8165    0   1   2
                34.76          6.54        2.5789    1   0   2
                35.29         15.73        2.5414    2   0   0
                35.62          2.54        2.5187    0   3   1
                36.45         24.35        2.4635    1   1   2
                36.86         27.55        2.4367    1   3   0
                36.96         12.08        2.4304    0   2   2
                40.01          2.14        2.2521    2   1   1
                41.60          9.72        2.1694    2   2   0
                43.42          2.94        2.0824    0   4   0
                44.38         40.91        2.0395    2   2   1
                46.12         18.39        1.9668    0   4   1
                46.87         15.94        1.9372    2   0   2
                48.12         27.33        1.8896    1   3   2
                50.30         22.27        1.8127    1   1   3
                50.70         10.49        1.7994    0   2   3
                51.01          1.69        1.7890    2   3   1
                52.03          3.65        1.7565    2   2   2
                53.57          2.43        1.7093    0   4   2
                55.29          2.01        1.6602    3   1   0
                57.14          1.77        1.6107    2   4   0
                57.57          8.70        1.5998    3   1   1
                58.24          1.01        1.5831    1   5   0
                59.38          8.28        1.5554    2   4   1
                60.44          8.18        1.5304    1   5   1
                61.97          1.40        1.4964    0   0   4
                63.07          1.08        1.4728    0   1   4
                63.28          3.14        1.4685    2   2   3
                64.09          2.70        1.4518    3   1   2
                64.37          4.34        1.4462    3   3   0
                64.65          1.23        1.4407    0   4   3
                65.79          2.88        1.4183    2   4   2
                65.99          3.80        1.4146    1   1   4
                66.33          1.64        1.4082    0   2   4
                66.80          2.59        1.3994    1   5   2
                67.41          2.23        1.3883    0   6   0
                72.54          7.62        1.3022    3   3   2
                73.37          3.28        1.2895    2   0   4
                74.26          7.11        1.2762    3   1   3
                74.33          7.03        1.2751    1   3   4
                74.64          3.24        1.2707    4   0   0
                75.42          3.36        1.2594    0   6   2
                75.85          6.46        1.2533    2   4   3
                76.80          6.09        1.2401    1   5   3
                77.42          1.02        1.2318    2   2   4
                78.44          5.61        1.2183    2   6   0
                80.59          4.02        1.1911    4   2   1
                82.39          1.72        1.1696    4   0   2
                82.77          3.89        1.1651    3   5   1
                83.75          3.36        1.1540    1   1   5
                84.06          1.47        1.1505    0   2   5
                85.25          2.88        1.1375    1   7   1
                86.10          3.10        1.1284    2   6   2
                86.33          1.44        1.1261    4   2   2
                87.74          1.20        1.1115    3   1   4
                88.49          1.37        1.1041    3   5   2
                89.28          1.12        1.0963    2   4   4
                89.28          1.12        1.0963    2   4   4
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.