Mannardite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from single crystal data of R130169
      Shi N, Ma Z, Liu W
      Acta Petrologica et Mineralogica 10 (1991) 233-245
      Crystal structure determination of ankangite with one dimensional incommensurate modulation
      Locality: Shiti barite deposit, Ankang County, Shaanxi, China
      _database_code_amcsd 0018318

      CELL PARAMETERS:  10.0830 10.0830  2.9470   90.000   90.000   90.000
      SPACE GROUP: I4/m      

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Ba     0.00000   0.00000   0.37900     0.295     2.600
            Ti     0.16520   0.34940   0.00000     0.650     0.550
            V      0.16520   0.34940   0.00000     0.350     0.550
            O      0.20260   0.15560   0.00000     1.000     0.430
            O      0.16730   0.53900   0.00000     1.000     0.570

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  9 +/-  9 +/-  2
            MAX. ABS. INTENSITY / VOLUME**2:      44.32986416    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                17.59          6.58        5.0415    2   0   0
                24.98         19.32        3.5649    2   2   0
                27.98         65.55        3.1885    3   1   0
                27.98         34.45        3.1885    1   3   0
                31.63          5.11        2.8287    1   0   1
                35.62          3.67        2.5208    4   0   0
                36.42         11.21        2.4669    1   2   1
                36.42         31.07        2.4669    2   1   1
                39.99         11.60        2.2546    4   2   0
                39.99          4.88        2.2546    2   4   0
                40.72         31.23        2.2158    3   0   1
                44.67          4.92        2.0286    2   3   1
                45.89          5.21        1.9774    1   5   0
                48.37          6.06        1.8819    4   1   1
                48.37         18.45        1.8819    1   4   1
                51.25          3.59        1.7824    4   4   0
                52.95          2.38        1.7292    5   3   0
                54.61         19.65        1.6805    6   0   0
                58.39          6.06        1.5804    2   5   1
                58.39         20.94        1.5804    5   2   1
                63.09          5.82        1.4735    0   0   2
                64.50          3.26        1.4448    1   6   1
                64.59          1.15        1.4430    1   1   2
                66.06          1.96        1.4143    2   0   2
                67.43         16.06        1.3889    4   5   1
                67.43          2.52        1.3889    5   4   1
                70.30          1.23        1.3390    3   6   1
                70.39          2.76        1.3376    3   1   2
                71.22          2.54        1.3240    7   3   0
                71.22          3.72        1.3240    3   7   0
                74.60          2.38        1.2721    4   0   2
                75.99          1.31        1.2523    3   3   2
                80.90          2.86        1.1883    6   6   0
                87.63          2.62        1.1135    9   1   0
                88.19          4.48        1.1079    6   0   2
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.