Calcite
      Maslen E N, Streltsov V A, Streltsova N R, Ishizawa N
      Acta Crystallographica B51 (1995) 929-939
      Electron density and optical anisotropy in rhombohedral carbonates.
      III. Synchrotron X-ray studies of CaCO3, MgCO3 and MnCO3
      _database_code_amcsd 0009890

      CELL PARAMETERS:    4.9880   4.9880  17.0680   90.000   90.000  120.000
      SPACE GROUP: R-3c      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    367.761
      Density (g/cm3):      2.711
      MAX. ABS. INTENSITY / VOLUME**2:      26.93170438    
      RIR:      3.235
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                23.08          8.40        3.8541    0   1   2         6
                29.42        100.00        3.0357    1   0   4         6
                31.45          2.09        2.8447    0   0   6         2
                36.01         14.37        2.4940    1   1   0         6
                39.45         19.07        2.2842    1   1   3        12
                43.21         14.80        2.0938    2   0   2         6
                47.16          6.59        1.9271    0   2   4         6
                47.53         20.06        1.9129    0   1   8         6
                48.55         20.86        1.8753    1   1   6        12
                56.63          3.50        1.6253    2   1   1        12
                57.47         10.00        1.6036    1   2   2        12
                60.74          5.85        1.5249    2   1   4        12
                61.05          2.71        1.5178    2   0   8         6
                61.42          2.90        1.5096    1   1   9        12
                63.12          2.13        1.4729    1   2   5        12
                64.74          6.96        1.4399    3   0   0         6
                65.64          3.91        1.4223    0   0  12         2
                69.26          1.38        1.3566    2   1   7        12
                70.29          2.40        1.3391    0   2  10         6
                72.96          3.11        1.2966    1   2   8        12
                77.21          2.34        1.2355    1   1  12        12
                81.60          2.68        1.1798    2   1  10        12
                83.88          1.67        1.1535    1   3   4        12
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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.