Magnesite
Diffraction data computed using the structure from the paper listed below,
along with the cell parameters refined from the powder pattern for R050443
      Graf D L
      American Mineralogist 46 (1961) 1283-1316
      Crystallographic tables for the rhombohedral carbonates

      CELL PARAMETERS:   4.634345   4.634345   15.01758   90.00000   90.00000   120.0000
      SPACE GROUP: R-3c
      X-RAY WAVELENGTH:     1.541838
               2-THETA      INTENSITY    D-SPACING   H   K   L
                32.67        100.00        2.7418    1   0   4
                35.88         13.07        2.5029    0   0   6
                38.87          6.30        2.3172    1   1   0
                43.01         49.05        2.1028    1   1   3
                46.86         12.62        1.9387    2   0   2
                51.64          5.33        1.7698    0   2   4
                53.91         17.79        1.7004    0   1   8
                53.91         22.11        1.7004    1   1   6
                61.41          4.62        1.5093    2   1   1
                62.44          6.85        1.4869    1   2   2
                66.45          6.14        1.4065    2   1   4
                68.41          2.13        1.3709    2   0   8
                69.38          6.22        1.3541    1   1   9
                69.38          2.67        1.3540    1   2   5
                70.34         12.40        1.3378    3   0   0
                76.01          4.46        1.2515    0   0  12
                76.95          1.70        1.2386    2   1   7
                79.72          1.69        1.2024    0   2  10
                81.55          3.13        1.1799    1   2   8
                88.82          1.28        1.1011    1   1  12
                88.82          1.28        1.1011    1   1  12
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.