Pyroxene-ideal
      Thompson R M, Downs R T
      American Mineralogist 88 (2003) 653-666
      Model pyroxenes I: Ideal pyroxene topologies
      Pyroxene #36 based on stacking sequence ABABACABACAC
      Note: Atoms Mg, Si, and O are assigned to atomic positions just for convenience.
      _database_code_amcsd 0003048

      CELL PARAMETERS:   19.5959   6.0000   3.4641   90.000   90.000   90.000
      SPACE GROUP: Pc        
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    407.293
      Density (g/cm3):      9.821
      MAX. ABS. INTENSITY / VOLUME**2:      17.20131934    
      RIR:      0.570
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                20.10          1.26        4.4188    3   1   0         2
                27.31          4.27        3.2660    6   0   0         1
                29.78          9.07        3.0000    0   2   0         2
                29.78         12.82        3.0000    0   1   1         2
                30.14          3.71        2.9654   -1   1   1         2
                30.14          3.71        2.9654    1   1   1         2
                31.18          7.09        2.8685   -2   1   1         2
                31.18          7.09        2.8685    2   1   1         2
                32.85          1.00        2.7262    3   1   1         2
                32.85          1.00        2.7262   -3   1   1         2
                40.02          1.71        2.2528   -1   2   1         2
                40.02          1.71        2.2528    1   2   1         2
                40.84         29.95        2.2094    6   2   0         2
                40.84          6.37        2.2094    6   1   1         2
                40.84          6.37        2.2094   -6   1   1         2
                40.84          1.88        2.2094   -2   2   1         2
                40.84          1.88        2.2094    2   2   1         2
                42.18         35.51        2.1423    3   2   1         2
                42.18         35.51        2.1423   -3   2   1         2
                44.00          3.74        2.0580    4   2   1         2
                44.00          3.74        2.0580   -4   2   1         2
                44.25         98.86        2.0467    9   1   0         2
                46.25         10.22        1.9629    5   2   1         2
                46.25         10.22        1.9629   -5   2   1         2
                47.95          2.29        1.8974    8   1   1         2
                47.95          2.29        1.8974   -8   1   1         2
                48.89          2.45        1.8628    6   2   1         2
                48.89          2.45        1.8628   -6   2   1         2
                51.89          4.01        1.7621    7   2   1         2
                51.89          4.01        1.7621   -7   2   1         2
                52.86          1.18        1.7321    0   3   1         2
                53.74          6.91        1.7056   -2   3   1         2
                53.74          6.91        1.7056    2   3   1         2
                53.74          3.46        1.7056   -2   0   2         1
                53.74          3.46        1.7056    2   0   2         1
                54.84          3.73        1.6742    3   3   1         2
                54.84          3.73        1.6742   -3   3   1         2
                54.84          1.86        1.6742    3   0   2         1
                54.84          1.86        1.6742   -3   0   2         1
                56.06          1.80        1.6406   10   1   1         2
                56.06          1.80        1.6406  -10   1   1         2
                56.34          4.53        1.6330   12   0   0         1
                56.34         13.52        1.6330    4   3   1         2
                56.34         13.52        1.6330   -4   3   1         2
                56.34          6.76        1.6330    4   0   2         1
                56.34          6.76        1.6330   -4   0   2         1
                57.12         13.54        1.6126    3   1   2         2
                57.12         13.54        1.6126   -3   1   2         2
                58.24          4.34        1.5842    5   3   1         2
                58.24          4.34        1.5842   -5   3   1         2
                58.24          2.17        1.5842   -5   0   2         1
                58.24          2.17        1.5842    5   0   2         1
                58.58          1.47        1.5757    4   1   2         2
                58.58          1.47        1.5757   -4   1   2         2
                58.79          1.76        1.5706   -9   2   1         2
                58.79          1.76        1.5706    9   2   1         2
                60.44          4.24        1.5317    5   1   2         2
                60.44          4.24        1.5317   -5   1   2         2
                60.50         15.59        1.5302    6   3   1         2
                60.50         15.59        1.5302   -6   3   1         2
                60.50          7.80        1.5302    6   0   2         1
                60.50          7.80        1.5302   -6   0   2         1
                61.85          1.31        1.5000    0   2   2         2
                62.66          1.07        1.4827    6   1   2         2
                62.66          1.07        1.4827   -6   1   2         2
                63.12          2.30        1.4729    7   3   1         2
                63.12          2.30        1.4729   -7   3   1         2
                63.12          1.15        1.4729    7   0   2         1
                63.12          1.15        1.4729   -7   0   2         1
                65.03          3.13        1.4343   12   1   1         2
                65.03          3.13        1.4343  -12   1   1         2
                65.22          1.86        1.4304    7   1   2         2
                65.22          1.86        1.4304   -7   1   2         2
                66.07          4.20        1.4142   -8   3   1         2
                66.07          4.20        1.4142    8   3   1         2
                66.07          2.10        1.4142    8   0   2         1
                66.07          2.10        1.4142   -8   0   2         1
                68.88          5.45        1.3631    6   4   0         2
                68.88          1.21        1.3631    6   2   2         2
                68.88          1.21        1.3631   -6   2   2         2
                69.33          1.01        1.3555   -9   3   1         2
                69.33          1.01        1.3555    9   3   1         2
                69.83          7.06        1.3469   -3   4   1         2
                69.83          7.06        1.3469    3   4   1         2
                72.83          2.25        1.2987    5   4   1         2
                72.83          2.25        1.2987   -5   4   1         2
                72.89          3.33        1.2978   10   3   1         2
                72.89          3.33        1.2978  -10   3   1         2
                72.89          1.66        1.2978   10   0   2         1
                72.89          1.66        1.2978  -10   0   2         1
                74.30          2.66        1.2765   15   1   0         2
                75.77          1.60        1.2554  -13   2   1         2
                75.77          1.60        1.2554   13   2   1         2
                76.75          1.48        1.2418  -11   3   1         2
                76.75          1.48        1.2418   11   3   1         2
                77.23          1.06        1.2352    7   4   1         2
                77.23          1.06        1.2352   -7   4   1         2
                80.91         10.87        1.1882   12   3   1         2
                80.91         10.87        1.1882  -12   3   1         2
                80.91          5.44        1.1882  -12   0   2         1
                80.91          5.44        1.1882   12   0   2         1
                85.37          2.05        1.1371  -13   3   1         2
                85.37          2.05        1.1371   13   3   1         2
                85.37          1.03        1.1371  -13   0   2         1
                85.37          1.03        1.1371   13   0   2         1
                85.85          1.81        1.1320   15   2   1         2
                85.85          1.81        1.1320  -15   2   1         2
                87.27          1.05        1.1172   13   1   2         2
                87.27          1.05        1.1172  -13   1   2         2
                88.51          1.27        1.1047   12   2   2         2
                88.51          1.27        1.1047  -12   2   2         2
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.