Archerite
      Ono Y, Yamada N, Hikita T
      Journal of the Physical Society of Japan 60 (1991) 2673-2677
      Structure refinements of the mixed crystal K0.78(NH4)0.22H2PO4
      in the temperature range from 20 K to 250K
      Note: T = 20 K
      Locality: synthetic
      _database_code_amcsd 0019080

      CELL PARAMETERS:    7.4398   7.4398   7.0454   90.000   90.000   90.000
      SPACE GROUP: I-42d     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    389.967
      Density (g/cm3):      2.204
      MAX. ABS. INTENSITY / VOLUME**2:      14.10897615    
      RIR:      2.084
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                17.33         22.74        5.1156    1   0   1         8
                23.92         98.85        3.7199    2   0   0         4
                29.69         12.94        3.0086    2   1   1         8
                30.54        100.00        2.9271    1   1   2         4
                34.09         21.54        2.6304    2   2   0         4
                35.08          9.38        2.5578    2   0   2         8
                38.26          4.93        2.3527    3   1   0         8
                38.48         12.08        2.3392    3   0   1         8
                40.27          4.55        2.2395    1   0   3         8
                45.82         12.73        1.9802    3   2   1         8
                46.41         54.12        1.9565    3   1   2         8
                47.38          3.18        1.9187    2   1   3         8
                48.97          1.34        1.8599    4   0   0         4
                52.34          1.69        1.7480    4   1   1         8
                53.76          2.04        1.7052    3   0   3         8
                55.21         10.23        1.6636    4   2   0         8
                57.93          8.98        1.5919    2   0   4         8
                58.82          9.98        1.5698    3   3   2         4
                59.65          3.44        1.5501    3   2   3         8
                63.57          9.36        1.4635    2   2   4         4
                63.95          1.59        1.4558    4   3   1         8
                66.29          1.03        1.4100    3   1   4         8
                69.76         10.58        1.3480    5   1   2         8
                71.77          4.27        1.3152    4   4   0         4
                74.14          9.89        1.2789    4   0   4         8
                76.88          1.72        1.2400    6   0   0         4
                79.20          7.85        1.2094    4   2   4         8
                79.97          7.39        1.1996    5   3   2         8
                81.89          5.19        1.1763    6   2   0         8
                82.47          1.53        1.1696    6   0   2         8
                84.55          3.32        1.1460    1   1   6         4
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.