Northupite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R060156
      Dal Negro A, Giuseppetti G, Tadini C
      Tschermaks Mineralogische und Petrographische Mitteilungen 22 (1975) 158-163
      Refinement of the crystal structure of northupite: Na3Mg(CO3)2Cl
      Locality: Searles Lake, California, USA

      CELL PARAMETERS:   14.06900   14.06900   14.06900   90.00000   90.00000   90.00000
      ALTERNATE SETTING FOR SPACE GROUP: Fd3
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                10.92         74.44        8.1144    1   1   1
                17.86         28.43        4.9691    2   2   0
                20.97          1.38        4.2376    3   1   1
                21.91          7.28        4.0572    2   2   2
                25.35         21.44        3.5137    4   0   0
                27.67         18.98        3.2244    3   3   1
                31.17         18.22        2.8689    4   2   2
                33.12         26.95        2.7048    5   1   1
                33.12         47.69        2.7048    3   3   3
                36.15        100.00        2.4845    4   4   0
                37.86         13.89        2.3757    5   1   3
                40.59          8.85        2.2222    6   0   2
                42.15         11.90        2.1433    5   3   3
                42.66         38.19        2.1188    6   2   2
                44.66         11.26        2.0286    4   4   4
                46.11          6.76        1.9680    7   1   1
                46.11          1.64        1.9680    5   5   1
                48.45          6.73        1.8781    6   2   4
                49.82          3.23        1.8298    7   3   1
                52.03         35.24        1.7568    8   0   0
                55.45          6.03        1.6564    8   2   2
                56.70          3.15        1.6229    7   1   5
                56.70          2.85        1.6229    5   5   5
                57.11         24.35        1.6122    6   6   2
                60.33          2.46        1.5335    8   2   4
                61.90          2.98        1.4982    6   6   4
                63.07          1.45        1.4733    9   3   1
                64.98         16.70        1.4344    8   4   4
                66.12          4.79        1.4125    7   7   1
                67.99          2.23        1.3782    8   2   6
                69.10          1.70        1.3587    7   7   3
                69.10          3.06        1.3587    9   5   1
                69.46          4.83        1.3524    6   6   6
                69.46          1.97        1.3524   10   2   2
                72.02          3.05        1.3106    9   3   5
                76.67          9.28        1.2423    8   8   0
                80.53          1.75        1.1921   11   3   3
                80.88          1.68        1.1878   10   6   2
                80.88          2.69        1.1878   10   2   6
                85.04          1.16        1.1400   12   2   2
                85.04          1.30        1.1400   10   6   4
                86.08          1.01        1.1289   11   5   3
                87.80          1.91        1.1111   12   0   4
                87.80          3.21        1.1111   12   4   0
                88.83          1.63        1.1008    9   9   1
                88.83          1.63        1.1008    9   9   1
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.