Pyrochlore
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from single crystal data of R110198
      Perrault G
      The Canadian Mineralogist 9 (1968) 383-402
      La composition chimique et la structure cristalline du pyrochlore d'Oka, P.Q.
      Sample: No. 3
      _database_code_amcsd 0005086

      CELL PARAMETERS:  10.4530 10.4530 10.4530   90.000   90.000   90.000
      SPACE GROUP: Fd3m      

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Nb     0.62500   0.62500   0.62500     1.000     1.490
            Ca     0.12500   0.12500   0.12500     1.000     1.490
            O      0.32200   0.00000   0.00000     1.000     1.490
            F      0.00000   0.00000   0.00000     1.000     1.490

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  9 +/-  9 +/-  9
            MAX. ABS. INTENSITY / VOLUME**2:      97.85981172    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                14.68         37.97        6.0350    1   1   1
                28.32         21.54        3.1517    3   1   1
                29.60        100.00        3.0175    2   2   2
                34.32         24.72        2.6133    4   0   0
                45.07          6.24        2.0117    3   3   3
                45.07          1.08        2.0117    5   1   1
                49.32         37.75        1.8478    4   4   0
                51.74          2.99        1.7669    5   3   1
                55.61          1.51        1.6528    6   2   0
                57.84          3.73        1.5941    5   3   3
                58.58         31.91        1.5758    6   2   2
                61.46          9.03        1.5088    4   4   4
                63.56          2.12        1.4637    5   5   1
                63.56          1.21        1.4637    7   1   1
                69.01          2.81        1.3609    7   3   1
                72.32          4.85        1.3066    8   0   0
                80.02         10.09        1.1990    6   6   2
                82.55          8.35        1.1687    8   4   0
                89.42          1.59        1.0958    9   3   1
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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.