Westerveldite
Diffraction data computed using the structute from the paper listed below,
along with the cell parameters refined from single crystal data of R060507
      Lyman P S, Prewitt C T
      Acta Crystallographica B40 (1984) 14-20
      Room- and high-pressure crystal chemistry of CoAs and FeAs
      Locality: synthetic
      Note: anisoB's taken from ICSD
      Sample: Pna2_1 refinement, P = .0001 GPa

      CELL PARAMETERS:   5.4050  5.9710  3.3640   90.000   90.000   90.000
      SPACE GROUP: Pna2_1    

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Fe     0.00316   0.19929   0.25000     1.000     0.530
            As     0.19923   0.57736   0.25120     1.000     0.452

            X-RAY WAVELENGTH:     1.541838
            BOUNDS ON TWO THETA:    0.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  4 +/-  5 +/-  3
            MAX. ABS. INTENSITY / VOLUME**2:      100.2980149    
            The INTENSITY cut off value is   1.00

               2-THETA      INTENSITY    D-SPACING   H   K   L
                30.50          7.06        2.9309    0   1   1
                34.31         47.06        2.6133    1   2   0
                34.82        100.00        2.5765    1   1   1
                36.49          3.91        2.4621    2   1   0
                42.93         15.30        2.1068    2   0   1
                43.87         36.55        2.0638    1   2   1
                45.26         37.08        2.0036    2   2   0
                45.66         76.53        1.9868    2   1   1
                48.76         10.95        1.8677    1   3   0
                53.10         18.44        1.7249    3   1   0
                53.21          3.93        1.7214    2   2   1
                53.49         39.87        1.7130    0   3   1
                54.56         27.97        1.6820    0   0   2
                57.51          5.83        1.6026    2   3   0
                59.97          2.79        1.5425    3   2   0
                60.30          7.38        1.5349    3   1   1
                64.39          3.27        1.4468    2   3   1
                64.79          8.11        1.4389    1   4   0
                66.06         12.64        1.4144    1   2   2
                66.71          1.26        1.4022    3   2   1
                67.43          1.19        1.3888    2   1   2
                69.57          4.19        1.3513    4   0   0
                70.50          1.89        1.3357    3   3   0
                71.29          2.26        1.3229    1   4   1
                71.60          1.94        1.3179    4   1   0
                72.31          1.86        1.3067    2   4   0
                73.52         14.69        1.2882    2   2   2
                75.88          5.29        1.2539    4   0   1
                76.17          4.65        1.2499    1   3   2
                77.84          3.23        1.2271    4   1   1
                79.61          9.94        1.2042    3   1   2
                82.77          4.30        1.1661    1   5   0
                83.28          3.68        1.1603    2   3   2
                83.65          3.35        1.1561    4   2   1
                84.24          1.60        1.1495    3   4   0
                85.39          1.91        1.1369    3   2   2
                86.47          2.02        1.1254    0   5   1
                87.19          3.76        1.1180    4   3   0
                88.81          4.58        1.1018    1   5   1
                89.67          6.33        1.0934    1   4   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.