Helium
      Schuch A F, Mills R L
      Physical Review Letters 6 (1961) 596-597
      New allotropic form of He3
      Locality: synthetic
      Sample: at T = 18.76 K & P = .171 GPa
      _database_code_amcsd 0015271

      CELL PARAMETERS:    4.2420   4.2420   4.2420   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     76.333
      Density (g/cm3):      0.348
      MAX. ABS. INTENSITY / VOLUME**2:     0.7352810442    
      RIR:      0.688
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                36.69        100.00        2.4491    1   1   1         8
                42.63         43.23        2.1210    2   0   0         6
                61.86         17.18        1.4998    2   2   0        12
                74.13         14.29        1.2790    3   1   1        24
                78.03          3.72        1.2246    2   2   2         8
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.