Fluorite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from the powder pattern of R050045
      Speziale S, Duffy T S
      Physics and Chemistry of Minerals 29 (2002) 465-472
      Single-crystal elastic constants of fluorite (CaF2) to 9.3 GPa
      Sample: P = 0 GPa

      CELL PARAMETERS:   5.4644  5.4644  5.4644   90.000   90.000   90.000
      SPACE GROUP: Fm3m      

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Ca     0.00000   0.00000   0.00000     1.000     1.300
            F      0.25000   0.25000   0.25000     1.000     1.000

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  5 +/-  5 +/-  5
            MAX. ABS. INTENSITY / VOLUME**2:      36.10946385    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                28.29         91.57        3.1549    1   1   1
                47.04        100.00        1.9320    2   2   0
                55.80         28.89        1.6476    3   1   1
                68.71         10.85        1.3661    4   0   0
                75.90          8.76        1.2536    3   3   1
                87.44         17.34        1.1154    4   2   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.