Melanotekite
      Dorsam G, Liebscher A, Wunder B, Franz G
      American Mineralogist 93 (2008) 573-583
      Crystal structures of synthetic melanotekite (Pb2Fe2Si2O9), kentrolite
      (Pb2Mn2Si2O9), and the aluminum analogue (Pb2Al2Si2O9)
      Locality: synthetic
      _database_code_amcsd 0004535

      CELL PARAMETERS:    6.9788  11.0164  10.0881   90.000   90.000   90.000
      SPACE GROUP: Pbcn      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    775.586
      Density (g/cm3):      6.219
      MAX. ABS. INTENSITY / VOLUME**2:      75.66451227    
      RIR:      3.962
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                16.09         52.44        5.5082    0   2   0         2
                17.42          3.69        5.0900    1   1   1         8
                17.58         47.37        5.0441    0   0   2         2
                18.35          5.52        4.8345    0   2   1         4
                21.74          2.14        4.0880    1   0   2         4
                22.37          3.63        3.9741    1   2   1         8
                23.21          3.53        3.8327    1   1   2         8
                23.92         39.45        3.7200    0   2   2         4
                25.53         45.48        3.4894    2   0   0         2
                27.16          1.78        3.2827    1   2   2         8
                27.45         55.49        3.2497    1   3   0         4
                28.25         20.16        3.1592    2   1   1         8
                28.86          8.37        3.0932    1   3   1         8
                30.32         23.84        2.9477    2   2   0         4
                30.61        100.00        2.9209    1   1   3         8
                31.16         17.42        2.8701    0   2   3         4
                31.17         45.30        2.8697    2   0   2         4
                31.62         28.08        2.8294    2   2   1         8
                32.51          1.19        2.7541    0   4   0         2
                32.78         97.74        2.7318    1   3   2         8
                33.74         13.62        2.6569    0   4   1         4
                35.27         10.99        2.5450    2   2   2         8
                35.60          9.53        2.5220    0   0   4         2
                36.18          6.52        2.4830    1   4   1         8
                36.63          3.90        2.4536    2   3   1         8
                37.20          5.10        2.4172    0   4   2         4
                37.93          6.77        2.3719    1   0   4         4
                38.05          1.53        2.3649    2   1   3         8
                38.53          7.67        2.3368    1   3   3         8
                39.45          1.87        2.2841    1   4   2         8
                40.63          1.85        2.2203    3   1   1         8
                40.70          3.85        2.2166    2   2   3         8
                41.45          1.75        2.1785    1   2   4         8
                41.78          2.43        2.1619    2   4   0         4
                42.42         10.97        2.1307    0   4   3         4
                42.78          4.56        2.1139    2   4   1         8
                42.81          3.07        2.1124    3   0   2         4
                43.05         16.93        2.1011    1   5   0         4
                43.16          7.58        2.0962    3   2   1         8
                43.63          1.30        2.0746    3   1   2         8
                44.32          7.29        2.0440    2   0   4         4
                45.53          2.44        1.9924    1   3   4         8
                45.66          5.53        1.9870    2   4   2         8
                46.02          4.01        1.9724    3   2   2         8
                46.20          5.38        1.9651    3   3   0         4
                46.84         17.24        1.9395    1   5   2         8
                47.64         21.77        1.9089    1   1   5         8
                48.02          8.87        1.8945    0   2   5         4
                48.28         12.13        1.8849    3   1   3         8
                49.65          3.34        1.8361    0   6   0         2
                49.80         25.50        1.8311    3   3   2         8
                50.17         13.18        1.8185    2   4   3         8
                50.50          1.31        1.8072    3   2   3         8
                51.14          3.00        1.7860    2   3   4         8
                52.27          7.16        1.7502    3   4   1         8
                52.31          1.37        1.7488    1   6   1         8
                52.35          2.55        1.7476    2   5   2         8
                52.45          4.23        1.7447    4   0   0         2
                53.08          3.37        1.7253    0   6   2         4
                53.45         10.00        1.7141    1   3   5         8
                53.60          3.61        1.7099    3   0   4         4
                53.98          5.96        1.6986    4   1   1         8
                54.05          2.92        1.6967    3   3   3         8
                54.29          1.93        1.6897    3   1   4         8
                54.58          1.25        1.6814    0   0   6         2
                55.17         13.97        1.6650    2   2   5         8
                56.34          3.49        1.6331    3   2   4         8
                56.54         17.69        1.6276    0   4   5         4
                56.65          7.34        1.6249    2   6   0         4
                57.16          7.17        1.6115    0   6   3         4
                57.29          1.23        1.6081    0   2   6         4
                57.62          3.34        1.5997    3   5   0         4
                58.77          2.22        1.5712    3   4   3         8
                59.36          2.64        1.5570    4   3   1         8
                60.29          9.94        1.5352    1   7   0         4
                60.36          3.30        1.5336    4   1   3         8
                60.74          1.36        1.5248    3   5   2         8
                61.41          4.78        1.5098    3   1   5         8
                61.66          2.40        1.5042    4   3   2         8
                61.92          2.49        1.4985    2   5   4         8
                63.02          9.68        1.4750    2   4   5         8
                63.32          4.46        1.4687    1   7   2         8
                63.60          6.54        1.4630    2   6   3         8
                63.72          2.83        1.4605    2   2   6         8
                63.82          1.41        1.4584    4   4   1         8
                64.99          1.35        1.4351    0   4   6         4
                65.00          2.26        1.4348    4   0   4         4
                65.41          2.50        1.4267    3   6   1         8
                66.04          1.94        1.4147    4   4   2         8
                66.81          1.17        1.4002    2   3   6         8
                66.83          8.94        1.3999    1   1   7         8
                67.01          4.00        1.3966    1   7   3         8
                67.14          1.85        1.3942    0   2   7         4
                68.09          1.17        1.3771    0   8   0         2
                68.72          2.95        1.3659    2   6   4         8
                68.91          1.90        1.3627    3   0   6         4
                69.18          3.52        1.3580    0   6   5         4
                70.18          1.29        1.3410    5   2   1         8
                70.46          1.88        1.3364    4   3   4         8
                70.95          1.63        1.3284    0   8   2         4
                71.18          1.20        1.3247    3   6   3         8
                71.29          1.92        1.3228    3   2   6         8
                71.46          1.01        1.3201    4   5   2         8
                71.63          1.14        1.3174    1   3   7         8
                71.92          1.81        1.3128    1   5   6         8
                72.01          2.09        1.3114    1   7   4         8
                72.52          1.16        1.3035    3   7   0         4
                74.01          1.46        1.2809    2   8   0         4
                74.04          1.54        1.2804    5   1   3         8
                74.28          1.05        1.2769    0   4   7         4
                74.45          1.16        1.2743    0   8   3         4
                75.06          3.28        1.2655    2   6   5         8
                75.23          1.54        1.2631    5   3   2         8
                75.30          2.07        1.2620    3   7   2         8
                76.29          1.06        1.2482    2   5   6         8
                76.37          1.56        1.2470    2   7   4         8
                76.77          2.37        1.2415    2   8   2         8
                77.20          2.51        1.2356    5   4   1         8
                77.39          1.18        1.2331    1   1   8         8
                77.68          2.70        1.2292    0   2   8         4
                78.25          2.78        1.2218    1   7   5         8
                78.29          1.04        1.2212    5   0   4         4
                78.57          3.19        1.2176    3   1   7         8
                78.74          2.36        1.2154    3   7   3         8
                79.76          2.36        1.2024    4   5   4         8
                80.02          3.68        1.1991    2   4   7         8
                80.18          1.17        1.1971    1   9   1         8
                80.57          1.90        1.1923    5   2   4         8
                80.75          2.24        1.1901    4   4   5         8
                81.27          1.19        1.1838    4   6   3         8
                81.95          2.71        1.1756    1   3   8         8
                82.64          1.02        1.1676    5   4   3         8
                83.23          1.10        1.1608    4   7   1         8
                83.36          1.85        1.1594    2   2   8         8
                84.21          1.51        1.1498    4   3   6         8
                84.26          2.27        1.1492    6   1   1         8
                84.41          1.06        1.1475    2   9   1         8
                85.58          2.76        1.1349    1   9   3         8
                85.69          1.56        1.1336    0   6   7         4
                88.53          2.01        1.1045    5   6   1         8
                88.68          1.13        1.1030    3   1   8         8
                88.82          1.60        1.1016    0  10   0         2
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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.