Zirsinalite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R060896
      Pudovkina Z V, Chernitsova N M, Voronkov A A, Pyatenko Yu A
      Doklady Akademii Nauk SSSR 250 (1980) 865-867
      Crystal structure of zirsinalite Na6Ca{Zr(Si6O18)}
      Locality: Koashva Mountain, Khibiny Massif, Kola Peninsula, Russia

      CELL PARAMETERS:   10.59300   10.59300   10.59300   58.13000   58.13000   58.13000
      SPACE GROUP: R-3c
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                11.99         40.65        7.3918    1   1   0
                16.77         45.81        5.2915    2   1   1
                17.19          1.05        5.1644    0  -1   1
                19.98          1.72        4.4476    2   1   0
                21.00         43.44        4.2335    2   0   0
                24.09          9.73        3.6959    2   2   0
                26.71         46.50        3.3383    3   2   1
                27.25         82.11        3.2740    2  -1   1
                29.73         19.69        3.0055    3   1   0
                31.48          2.86        2.8426    3   2   0
                33.88        100.00        2.6457    4   2   2
                34.74         89.03        2.5822    0  -2   2
                35.64          1.01        2.5190    4   3   3
                36.47          1.99        2.4639    4   1   1
                38.22          1.89        2.3547    4   3   1
                39.81         14.43        2.2640    4   4   2
                40.56          6.03        2.2238    4   2   0
                41.26          3.58        2.1877    4   4   4
                42.71         20.05        2.1168    4   0   0
                43.65         12.16        2.0735    5   3   2
                45.84          6.93        1.9790    5   2   1
                46.35          1.42        1.9586    4  -1   1
                46.51          1.47        1.9520    2  -3   1
                49.30         58.72        1.8480    4   4   0
                49.66          2.40        1.8352    5   5   4
                50.61          3.05        1.8031    5   4   1
                51.23         14.06        1.7826    5   1   0
                51.54          7.87        1.7726   -1  -1   4
                51.82          1.62        1.7638    6   3   3
                53.04          1.17        1.7260    3  -2   3
                53.19          5.27        1.7215    0  -3   3
                53.84          4.64        1.7023    6   2   2
                54.73          7.01        1.6766    0  -2   4
                55.00          1.22        1.6692    6   4   2
                56.07          9.96        1.6398    6   5   3
                56.94          5.03        1.6168    6   3   1
                57.51          7.01        1.6019    5  -1   2
                57.80          3.54        1.5947    3  -3   2
                60.04         15.81        1.5404    6   6   4
                61.70         24.33        1.5028    6   2   0
                62.25          9.50        1.4908    2  -4   2
                63.79          2.83        1.4584    6   6   6
                63.65          7.06        1.4614    4  -3   1
                63.89          3.57        1.4565    6   5   1
                65.67          3.23        1.4213    6   4   0
                66.60          1.44        1.4035    7   6   5
                67.65          7.67        1.3843    7   5   2
                68.54          1.07        1.3685    7   6   3
                68.95          8.14        1.3613    5  -2   3
                70.47          1.33        1.3356    4  -3   3
                73.28         11.60        1.2911    0  -4   4
                73.83          1.33        1.2830    7   3   0
                77.21          3.16        1.2350    4  -4   2
                79.07          3.53        1.2104    6  -1   5
                83.22          9.27        1.1603    6  -2   4
                86.14          1.72        1.1282    6  -3   1
                86.14          1.72        1.1282    6  -3   1
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.