Pyroxene-ideal
      Thompson R M, Downs R T
      American Mineralogist 88 (2003) 653-666
      Model pyroxenes I: Ideal pyroxene topologies
      Pyroxene #3b based on stacking sequence ABABCACABCBC. Ideal analogue of low
      clinopyroxene.
      Note: Atoms Mg, Si, and O are assigned to atomic positions just for convenience.
      _database_code_amcsd 0002999

      CELL PARAMETERS:    6.9282   6.0000   3.4641   90.000  109.471   90.000
      SPACE GROUP: P2_1/c    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    135.764
      Density (g/cm3):      9.821
      MAX. ABS. INTENSITY / VOLUME**2:      20.48508925    
      RIR:      0.679
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                20.10          1.06        4.4188    1   1   0         4
                27.31          3.59        3.2660    2   0   0         2
                29.78          7.62        3.0000    0   2   0         2
                30.14          3.40        2.9654   -1   1   1         4
                31.18         21.09        2.8685    0   1   1         4
                35.07          1.33        2.5584   -2   1   1         4
                40.02          5.03        2.2528   -1   2   1         4
                40.84         11.38        2.2094    0   2   1         4
                40.84         25.15        2.2094    2   2   0         4
                44.00         58.16        2.0580   -2   2   1         4
                44.25         83.01        2.0467    3   1   0         4
                44.25         16.99        2.0467   -3   1   1         4
                46.25         10.71        1.9629    1   2   1         4
                53.08         10.15        1.7253   -1   3   1         4
                53.08          5.08        1.7253   -1   0   2         2
                53.74         14.15        1.7056    0   3   1         4
                53.74          7.07        1.7056   -2   0   2         2
                55.20         14.54        1.6641    2   2   1         4
                55.41          1.76        1.6581   -1   1   2         4
                56.06          4.33        1.6406   -2   1   2         4
                56.34         40.98        1.6330   -2   3   1         4
                56.34         20.49        1.6330    0   0   2         2
                56.34          3.80        1.6330    4   0   0         2
                58.58         23.03        1.5757    0   1   2         4
                60.44          8.32        1.5317    3   1   1         4
                60.44          4.45        1.5317   -3   1   2         4
                62.66          2.37        1.4827   -2   2   2         4
                63.12         25.24        1.4729   -3   3   1         4
                63.12         12.62        1.4729    1   0   2         2
                66.07          2.11        1.4142    2   3   1         4
                66.07          1.05        1.4142   -4   0   2         2
                68.12          7.13        1.3765   -4   1   2         4
                68.88          2.40        1.3631    0   4   1         4
                68.88          4.58        1.3631    2   4   0         4
                71.15         12.05        1.3252   -2   4   1         4
                71.33          3.54        1.3222    1   2   2         4
                72.83          2.38        1.2987    1   4   1         4
                72.89          3.87        1.2978    2   0   2         2
                72.89          7.74        1.2978   -4   3   1         4
                74.30          2.23        1.2765    5   1   0         4
                75.77          3.96        1.2554   -5   2   1         4
                79.95          4.23        1.2000    2   4   1         4
                80.67          2.21        1.1911    4   2   1         4
                84.42          2.87        1.1474   -5   2   2         4
                85.37         12.32        1.1371    3   0   2         2
                85.37         24.64        1.1371   -5   3   1         4
                87.27          2.63        1.1172    3   1   2         4
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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.