Latrappite
Diffraction data computed using the structure from the paper listed below, 
along with the cell parameters refined from the powder pattern of R060345
      Mitchell R H, Choi J B, Hawthorne F C, McCammon C A, Burns P C
      The Canadian Mineralogist 36 (1998) 107-116
      Latrappite: A re-investigation

      CELL PARAMETERS:   5.4410  5.4930  7.7270   90.000   90.000   90.000
      SPACE GROUP: Pbnm      

           ATOM        X         Y         Z     OCCUPANCY  ISO(B)
            Ca    -0.00760   0.03590   0.25000     0.750     0.610
            Na    -0.00760   0.03590   0.25000     0.250     0.610
            Nb     0.00000   0.50000   0.00000     0.570     0.400
            Fe     0.00000   0.50000   0.00000     0.150     0.400
            Ti     0.00000   0.50000   0.00000     0.280     0.400
            O      0.07640   0.07640   0.25000     1.000     0.530
            O      0.70870   0.28710   0.03640     1.000     0.500

            X-RAY WAVELENGTHS:   1.540562  1.544390
            BOUNDS ON TWO THETA:    5.0  90.0
            LIMITS IMPOSED ON THE INDICES ARE:  +/-  4 +/-  5 +/-  7
            MAX. ABS. INTENSITY / VOLUME**2:      98.64149142    
            The INTENSITY cut off value is   1.00

               2-THETA          INTENSITY       D-SPACING   H   K   L
            22.99 / 23.05     4.36 /  2.18       3.8656     1   1   0
            23.00 / 23.06    11.29 /  5.64       3.8635     0   0   2
            25.75 / 25.81     2.32 /  1.16       3.4571     1   1   1
            32.58 / 32.66    13.17 /  6.59       2.7465     0   2   0
            32.74 / 32.83   100.00 / 50.00       2.7327     1   1   2
            32.90 / 32.98    14.13 /  7.06       2.7205     2   0   0
            34.63 / 34.72     1.95 /  0.97       2.5879     0   2   1
            36.84 / 36.93     1.04 /  0.52       2.4379     2   1   0
            38.64 / 38.74     1.30 /  0.65       2.3280     1   0   3
            42.12 / 42.23     1.19 /  0.60       2.1434     1   1   3
            46.97 / 47.10    20.82 / 10.41       1.9328     2   2   0
            47.00 / 47.12    11.78 /  5.89       1.9318     0   0   4
            48.41 / 48.54     1.34 /  0.67       1.8788     0   2   3
            48.51 / 48.64     1.28 /  0.64       1.8750     2   2   1
            52.70 / 52.84     2.01 /  1.01       1.7354     1   3   0
            52.93 / 53.07     5.29 /  2.65       1.7286     2   2   2
            52.94 / 53.09     1.27 /  0.63       1.7280     1   1   4
            53.14 / 53.28     1.48 /  0.74       1.7222     3   1   0
            54.12 / 54.27     1.82 /  0.91       1.6932     1   3   1
            58.23 / 58.39    13.15 /  6.57       1.5830     1   3   2
            58.35 / 58.51     5.56 /  2.78       1.5801     0   2   4
            58.56 / 58.72     5.92 /  2.96       1.5751     2   0   4
            58.64 / 58.80    14.41 /  7.20       1.5730     3   1   2
            68.24 / 68.43     1.91 /  0.95       1.3733     0   4   0
            68.63 / 68.83     9.66 /  4.83       1.3663     2   2   4
            68.98 / 69.18     2.20 /  1.10       1.3602     4   0   0
            73.07 / 73.28     1.37 /  0.69       1.2939     0   4   2
            73.26 / 73.48     1.34 /  0.67       1.2910     1   3   4
            73.63 / 73.84     1.01 /  0.51       1.2855     3   1   4
            77.85 / 78.08     1.46 /  0.73       1.2259     2   4   0
            78.12 / 78.36     3.67 /  1.84       1.2223     3   3   2
            78.17 / 78.40     5.92 /  2.96       1.2218     1   1   6
            78.38 / 78.62     1.82 /  0.91       1.2189     4   2   0
            86.98 / 87.25     1.65 /  0.82       1.1193     0   4   4
            87.67 / 87.94     1.98 /  0.99       1.1122     4   0   4
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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.