Stishovite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from single crystal data of R080042
      Ross N L, Shu J F, Hazen R M, Gasparik T
      American Mineralogist 75 (1990) 739-747
      High-pressure crystal chemistry of stishovite
      P = 0, but in the diamond cell

      CELL PARAMETERS:   4.1780  4.1780  2.6660   90.000   90.000   90.000
      SPACE GROUP: P4_2/mnm  

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Si     0.00000   0.00000   0.00000     1.000     0.150
            O      0.30670   0.30670   0.00000     1.000     0.310

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  3 +/-  3 +/-  2
            MAX. ABS. INTENSITY / VOLUME**2:      27.08213723    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                30.25        100.00        2.9543    1   1   0
                40.12         24.59        2.2474    1   0   1
                45.85         39.10        1.9792    1   1   1
                48.74         14.96        1.8685    2   1   0
                60.51         58.49        1.5301    2   1   1
                62.92         19.33        1.4771    2   2   0
                70.67         10.08        1.3330    0   0   2
                71.39          6.30        1.3212    3   1   0
                73.26          1.34        1.2921    2   2   1
                77.30         26.66        1.2344    3   0   1
                78.76         10.47        1.2150    1   1   2
                81.27          2.02        1.1838    3   1   1
                86.64          1.24        1.1237    2   0   2
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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.