Beryl
      Gibbs G V, Breck D W, Meagher E P
      Lithos 1 (1968) 275-285
      Structural refinement of hydrous and anhydrous synthetic beryl,
      Al2(Be3Si6)O18 and emerald, Al1.9Cr0.1(Be3Si6)O18
      Note: anhydrous emerald
      Locality: synthetic
      _database_code_amcsd 0019468

      CELL PARAMETERS:    9.2190   9.2190   9.1980   90.000   90.000  120.000
      SPACE GROUP: P6/mcc    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    677.005
      Density (g/cm3):      2.649
      MAX. ABS. INTENSITY / VOLUME**2:      19.25201434    
      RIR:      2.367
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                11.08        100.00        7.9839    1   0   0         6
                19.26          3.18        4.6095    1   1   0         6
                19.30         22.87        4.5990    0   0   2         2
                22.27          5.91        3.9919    2   0   0         6
                22.31         17.50        3.9851    1   0   2        12
                27.39         55.81        3.2557    1   1   2        12
                29.60          2.33        3.0176    2   1   0        12
                29.63         11.60        3.0147    2   0   2        12
                31.19         54.98        2.8673    2   1   1        24
                35.58         14.94        2.5230    2   1   2        24
                39.18          4.31        2.2995    0   0   4         2
                40.75          1.24        2.2143    3   1   0        12
                41.97          4.75        2.1528    3   1   1        24
                44.01          1.93        2.0577    1   1   4        12
                45.44          2.58        1.9960    4   0   0         6
                45.46          1.75        1.9951    3   1   2        24
                45.52          6.68        1.9926    2   0   4        12
                49.78          2.70        1.8316    3   2   0        12
                50.87          6.21        1.7951    3   1   3        24
                52.53          4.88        1.7422    4   1   0        12
                52.60          7.33        1.7400    3   0   4        12
                53.53          4.93        1.7118    4   1   1        24
                56.48          1.19        1.6292    4   1   2        24
                56.53          7.85        1.6278    2   2   4        12
                57.74          3.25        1.5968    5   0   0         6
                57.81          1.83        1.5950    3   1   4        24
                58.72          3.59        1.5724    3   2   3        24
                58.79          1.62        1.5707    2   1   5        24
                60.38          3.21        1.5330    0   0   6         2
                61.19          9.37        1.5148    4   1   3        24
                63.88          2.97        1.4573    3   3   2        12
                64.01          3.11        1.4547    1   1   6        12
                65.06          4.06        1.4336    4   2   2        24
                65.11          4.08        1.4327    3   2   4        24
                68.55          2.58        1.3689    5   1   2        24
                68.67          2.80        1.3667    2   1   6        24
                74.17          2.44        1.2784    5   2   0        12
                74.19          5.60        1.2782    6   0   2        12
                74.31          1.07        1.2764    2   2   6        12
                75.01          4.91        1.2663    5   2   1        24
                75.10          3.09        1.2650    4   1   5        24
                75.34          2.33        1.2615    4   2   4        24
                75.42          1.24        1.2604    3   1   6        24
                78.57          1.07        1.2175    6   1   0        12
                79.42          4.74        1.2066    4   3   3        24
                79.57          4.31        1.2047    2   1   7        24
                84.04          1.62        1.1517    6   0   4        12
                84.21          2.16        1.1497    0   0   8         2
                85.11          1.86        1.1399    4   3   4        24
                87.25          2.14        1.1174    5   2   4        24
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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.