Helium
      Schuch A F, Mills R L
      Physical Review Letters 6 (1961) 596-597
      New allotropic form of He3
      Locality: synthetic
      Sample: at T = 15.98 K & P = .136 GPa
      _database_code_amcsd 0015272

      CELL PARAMETERS:    3.0460   3.0460   4.9860   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     40.063
      Density (g/cm3):      0.332
      MAX. ABS. INTENSITY / VOLUME**2:     0.6262539153    
      RIR:      0.615
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                33.98         25.95        2.6379    1   0   0         6
                36.03         28.40        2.4930    0   0   2         2
                38.61        100.00        2.3317    1   0   1        12
                50.36         11.67        1.8119    1   0   2        12
                60.82          9.93        1.5230    1   1   0         6
                66.49          9.70        1.4062    1   0   3        12
                71.53          1.13        1.3190    2   0   0         6
                72.76          8.33        1.2997    1   1   2        12
                74.40          5.61        1.2751    2   0   1        12
                76.41          1.10        1.2465    0   0   4         2
                82.79          1.13        1.1658    2   0   2        12
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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.