Gehlenite
      Louisnathan S J
      The Canadian Mineralogist 10 (1971) 822-837
      Refinement of the crystal structure of a natural gehlenite, Ca2Al(Al,Si)2O7
      Locality: Crestmore, California, USA
      _database_code_amcsd 0005090

      CELL PARAMETERS:    7.7160   7.7160   5.0890   90.000   90.000   90.000
      SPACE GROUP: P-42_1m   
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    302.982
      Density (g/cm3):      3.010
      MAX. ABS. INTENSITY / VOLUME**2:      21.14048490    
      RIR:      2.287
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                16.25          5.41        5.4560    1   1   0         4
                17.43          2.59        5.0890    0   0   1         2
                20.91          2.97        4.2482    1   0   1         8
                23.05          1.42        3.8580    2   0   0         4
                23.91         18.32        3.7215    1   1   1         4
                25.82          2.57        3.4507    2   1   0         8
                29.04         21.43        3.0744    2   0   1         8
                31.32        100.00        2.8560    2   1   1         8
                32.83          5.00        2.7280    2   2   0         4
                35.27          3.39        2.5445    0   0   2         2
                36.84         16.87        2.4400    3   1   0         8
                37.21          7.73        2.4165    1   0   2         8
                37.40          9.01        2.4043    2   2   1         4
                39.06          3.53        2.3061    1   1   2         4
                39.25          8.71        2.2955    3   0   1         8
                41.02          1.65        2.2002    3   1   1         8
                44.23          9.93        2.0479    2   1   2         8
                46.01          2.29        1.9727    3   2   1         8
                47.11          8.20        1.9290    4   0   0         4
                48.65          4.30        1.8714    4   1   0         8
                48.95          2.57        1.8607    2   2   2         4
                50.16          8.94        1.8187    3   3   0         4
                51.92         24.55        1.7611    3   1   2         8
                52.07          7.44        1.7564    4   1   1         8
                53.08          6.05        1.7254    4   2   0         8
                53.51          3.28        1.7126    3   3   1         4
                56.16          2.10        1.6378    3   2   2         8
                56.84          1.39        1.6198    1   1   3         4
                60.85          8.40        1.5223    2   1   3         8
                62.80          1.78        1.4796    3   3   2         4
                64.21          1.89        1.4505    5   1   1         8
                64.71          3.93        1.4405    2   2   3         4
                65.35          1.59        1.4280    4   2   2         8
                65.97          1.46        1.4161    3   0   3         8
                67.21          1.87        1.3928    3   1   3         8
                67.97         10.14        1.3792    5   2   1         8
                68.83          3.58        1.3640    4   4   0         4
                70.89          1.23        1.3294    3   2   3         8
                71.50          1.13        1.3195    4   3   2         8
                71.63          1.21        1.3175    4   4   1         4
                73.66          3.55        1.2860    6   0   0         4
                74.59          1.38        1.2723    0   0   4         2
                75.67          4.42        1.2568    4   1   3         8
                76.26          1.21        1.2485    5   2   2         8
                76.85          1.01        1.2405    3   3   3         4
                77.56          1.33        1.2308    6   1   1         8
                81.05          1.58        1.1864    6   2   1         8
                82.21          2.22        1.1726    5   4   1         8
                84.39          2.09        1.1477    6   0   2         8
                85.07          1.19        1.1404    3   0   4         8
                86.11          2.19        1.1292    5   1   3         8
                86.22          2.07        1.1281    3   1   4         8
                89.54          2.13        1.0946    5   2   3         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.