Eugenite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from single crystal data of R070463
       Owen E A, O'Donnell Roberts E A 
      Journal of the Institute of Metals 71 (1945) 213-254
       The solubility of certain metals in gold 
      CELL PARAMETERS:   4.0940  4.0940  4.0940   90.000   90.000   90.000
      SPACE GROUP: Fm-3m     

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Au     0.00000   0.00000   0.00000     0.800     1.000
            Hg     0.00000   0.00000   0.00000     0.200     1.000

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    0.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  3 +/-  3 +/-  3
            MAX. ABS. INTENSITY / VOLUME**2:      1768.951272    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                38.07        100.00        2.3637    1   1   1
                44.25         47.99        2.0470    2   0   0
                64.36         28.49        1.4474    2   2   0
                77.30         31.42        1.2344    3   1   1
                81.43          8.97        1.1818    2   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.