Ca2(Mg.55Fe.45)Si2O7
      Kusaka K, Hagiya K, Ohmasa M, Okano Y, Mukai M, Iishi K, Haga N
      Physics and Chemistry of Minerals 28 (2001) 150-166
      Determination of structures of Ca2CoSi2O7, Ca2MgSi2O7, and Ca2(Mg.55Fe.45)Si2O7
      in incommensurate and normal phases and observation of diffuse streaks at high temperature
      Sample: T = 773 K
      Melilite group
      _database_code_amcsd 0008532

      CELL PARAMETERS:    7.8989   7.8989   5.0237   90.000   90.000   90.000
      SPACE GROUP: P-42_1m   
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    313.442
      Density (g/cm3):      3.039
      MAX. ABS. INTENSITY / VOLUME**2:      20.50753273    
      RIR:      2.198
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                15.87          3.05        5.5854    1   1   0         4
                17.65          6.72        5.0237    0   0   1         2
                20.96          6.54        4.2390    1   0   1         8
                23.82         17.39        3.7351    1   1   1         4
                25.21          4.43        3.5325    2   1   0         8
                28.75         36.61        3.1048    2   0   1         8
                30.95        100.00        2.8896    2   1   1         8
                32.05          6.35        2.7927    2   2   0         4
                35.75          3.58        2.5119    0   0   2         2
                35.95         22.57        2.4979    3   1   0         8
                36.82          5.50        2.4409    2   2   1         4
                37.57          6.30        2.3937    1   0   2         8
                38.61          6.19        2.3321    3   0   1         8
                39.33          2.38        2.2909    1   1   2         4
                40.32          2.10        2.2366    3   1   1         8
                44.25         10.17        2.0471    2   1   2         8
                45.15          1.86        2.0081    3   2   1         8
                45.96          3.46        1.9747    4   0   0         4
                47.46          6.48        1.9158    4   1   0         8
                48.76          5.46        1.8676    2   2   2         4
                48.92          7.01        1.8618    3   3   0         4
                51.02          7.95        1.7900    4   1   1         8
                51.60         20.53        1.7712    3   1   2         8
                51.76          6.69        1.7662    4   2   0         8
                52.41          4.05        1.7458    3   3   1         4
                55.12          1.64        1.6663    4   2   1         8
                55.67          2.23        1.6510    3   2   2         8
                57.45          1.72        1.6040    1   1   3         4
                60.01          1.80        1.5417    2   0   3         8
                61.26          4.22        1.5132    2   1   3         8
                62.77          3.51        1.4803    5   1   1         8
                64.49          1.32        1.4448    4   2   2         8
                64.93          3.26        1.4362    2   2   3         4
                66.13          1.58        1.4130    3   0   3         8
                66.40          6.86        1.4080    5   2   1         8
                67.02          2.56        1.3963    4   4   0         4
                67.32          1.07        1.3909    3   1   3         8
                69.92          1.74        1.3453    4   4   1         4
                71.69          2.41        1.3165    6   0   0         4
                75.39          3.19        1.2608    4   1   3         8
                76.51          1.60        1.2450    3   3   3         4
                79.00          1.78        1.2120    6   2   1         8
                80.11          1.49        1.1980    5   4   1         8
                80.57          1.08        1.1923    5   3   2         8
                82.77          1.70        1.1660    6   0   2         8
                85.37          1.73        1.1372    5   1   3         8
                86.79          1.24        1.1221    3   1   4         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.