PON
      Leger J M, Haines J, Chateau C, Bocquillon G, Schmidt M W, Hull S,
      Gorelli F, Lesauze A, Marchand R
      Physics and Chemistry of Minerals 28 (2001) 388-398
      Phosphorus oxynitride PON, a silica analogue: structure and compression
      of the cristobalite-like phase; P-T phase diagram
      Note: cristobalite structure type
      _database_code_amcsd 0008557

      CELL PARAMETERS:    4.6186   4.6186   6.9788   90.000   90.000   90.000
      SPACE GROUP: I-42d     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    148.872
      Density (g/cm3):      2.720
      MAX. ABS. INTENSITY / VOLUME**2:      42.80010977    
      RIR:      5.123
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                23.09        100.00        3.8516    1   0   1         8
                37.73         33.15        2.3844    1   1   2         4
                39.00          1.91        2.3093    2   0   0         4
                43.56          2.27        2.0776    1   0   3         8
                45.81          8.54        1.9806    2   1   1         8
                47.20          1.46        1.9258    2   0   2         8
                56.34          3.75        1.6329    2   2   0         4
                59.88         10.31        1.5445    2   1   3         8
                67.25          6.71        1.3921    2   0   4         8
                69.81          5.89        1.3473    3   1   2         8
                73.81          2.50        1.2839    3   0   3         8
                75.45          5.17        1.2599    3   2   1         8
                80.58          1.53        1.1922    2   2   4         4
                83.61          3.29        1.1565    2   1   5         8
                88.38          2.57        1.1060    4   1   1         8
                89.43          1.83        1.0957    1   1   6         4
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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.