Br H4 N
      Bartlett G, Langmuir I
      Journal of the American Chemical Society 43 (1921) 84-91
      The Crystal Structure of the Ammonium Halides Above and Below the
      Transition Temperature
      _cod_database_code 1010074
      _database_code_amcsd 0017008

      CELL PARAMETERS:    6.9000   6.9000   6.9000   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    328.509
      Density (g/cm3):      1.899
      MAX. ABS. INTENSITY / VOLUME**2:      40.84971626    
      RIR:      7.006
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                22.32         91.91        3.9837    1   1   1         8
                25.82        100.00        3.4500    2   0   0         6
                36.84         71.51        2.4395    2   2   0        12
                43.50         44.72        2.0804    3   1   1        24
                45.54         24.15        1.9919    2   2   2         8
                53.09         10.76        1.7250    4   0   0         6
                58.29         17.76        1.5830    3   3   1        24
                59.96         28.15        1.5429    4   2   0        24
                66.37         19.69        1.4085    4   2   2        24
                70.98          9.29        1.3279    5   1   1        24
                70.98          3.10        1.3279    3   3   3         8
                78.40          5.63        1.2198    4   4   0        12
                82.75         11.59        1.1663    5   3   1        48
                84.19          9.09        1.1500    4   4   2        24
                84.19          2.27        1.1500    6   0   0         6
                89.92          7.64        1.0910    6   2   0        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.