Praseodymium
      Spedding F H, Daane A H, Herrmann K W
      Acta Crystallographica 9 (1956) 559-563
      The crystal structures and lattice parameters of high-purity scandium,
      yttrium and the rare earth metals
      Locality: synthetic
      Note: sample 99.9% pure
      _database_code_amcsd 0009170

      CELL PARAMETERS:    3.6725   3.6725  11.8354   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    138.241
      Density (g/cm3):      3.385
      MAX. ABS. INTENSITY / VOLUME**2:      144.0178165    
      RIR:     13.855
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                14.97        100.00        5.9177    0   0   2         2
                28.06         16.09        3.1805    1   0   0         6
                29.07         87.71        3.0715    1   0   1        12
                30.21         17.56        2.9588    0   0   4         2
                31.95         22.53        2.8015    1   0   2        12
                36.28         46.76        2.4761    1   0   3        12
                41.69         10.16        2.1663    1   0   4        12
                46.01          4.92        1.9726    0   0   6         2
                47.91         19.33        1.8989    1   0   5        12
                49.65         11.41        1.8362    1   1   0         6
                52.15         19.25        1.7538    1   1   2        12
                54.76          4.05        1.6763    1   0   6        12
                58.00          1.65        1.5902    2   0   0         6
                58.57          9.55        1.5761    2   0   1        12
                59.22         12.24        1.5602    1   1   4        12
                60.26          2.87        1.5358    2   0   2        12
                62.18          7.69        1.4929    1   0   7        12
                62.81          1.65        1.4794    0   0   8         2
                63.02          7.32        1.4749    2   0   3        12
                66.78          1.98        1.4007    2   0   4        12
                70.00          6.66        1.3440    1   1   6        12
                70.16          1.65        1.3414    1   0   8        12
                71.47          4.64        1.3200    2   0   5        12
                77.03          1.19        1.2380    2   0   6        12
                78.75          3.31        1.2153    1   0   9        12
                80.27          2.07        1.1960    2   1   1        24
                83.44          2.75        1.1584    2   0   7        12
                84.01          3.59        1.1520    1   1   8        12
                84.20          1.78        1.1499    2   1   3        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.