Megakalsilite
      Khomyakov A P, Nechelyustov G N, Sokolova E V, Bonaccorsi E, Merlino S, Pasero M
      The Canadian Mineralogist 40 (2002) 961-970
      Megakalsilite, a new polymorph of KAlSiO4 from the Khibina alkaline massif,
      Kola Peninsula, Russia: mineral description and crystal structure
      Locality: Khibina alkaline massif, Kola Peninsula, Russia
      _database_code_amcsd 0005778

      CELL PARAMETERS:   18.1111  18.1111   8.4619   90.000   90.000  120.000
      SPACE GROUP: P6_3      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   2403.744
      Density (g/cm3):      2.622
      MAX. ABS. INTENSITY / VOLUME**2:      16.88224826    
      RIR:      2.097
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                14.33         10.19        6.1827    1   1   1         6
                19.61          4.75        4.5278    2   2   0         6
                21.00         11.34        4.2309    0   0   2         1
                22.27         13.30        3.9922    2   2   1         6
                28.12         21.03        3.1729    1   4   1         6
                28.12         18.10        3.1729    4   1   1         6
                28.88        100.00        3.0913    2   2   2         6
                31.47          4.31        2.8430    3   3   1         6
                33.27          4.86        2.6930    1   1   3         6
                34.30         46.08        2.6141    6   0   0         6
                35.75          1.15        2.5116    5   2   0         6
                35.96         11.73        2.4976    6   0   1         6
                37.35          3.16        2.4077    2   5   1         6
                37.35          1.08        2.4077    5   2   1         6
                37.57          3.16        2.3941    2   2   3         6
                39.82          4.25        2.2639    4   4   0         6
                40.57          2.93        2.2239    6   0   2         6
                41.83          1.01        2.1597    5   2   2         6
                42.74         11.22        2.1155    0   0   4         1
                43.93          2.93        2.0609    3   3   3         6
                45.44          1.70        1.9961    4   4   2         6
                47.23          1.18        1.9243    6   3   1         6
                47.42          2.86        1.9173    6   0   3         6
                47.44          1.68        1.9166    2   2   4         6
                48.53          2.48        1.8757    2   5   3         6
                48.53          2.61        1.8757    5   2   3         6
                51.61          3.43        1.7710    5   5   1         6
                51.78          1.99        1.7655    4   4   3         6
                54.72          1.65        1.6774    2   8   1         6
                54.72          1.12        1.6774    8   2   1         6
                54.89          4.64        1.6727    1   7   3         6
                54.89          4.02        1.6727    7   1   3         6
                55.21          1.10        1.6636    1   1   5         6
                55.91          3.06        1.6445    6   0   4         6
                57.72          1.92        1.5972    7   4   1         6
                58.15          6.12        1.5865    2   8   2         6
                58.15          3.98        1.5865    8   2   2         6
                58.20          2.05        1.5853    2   2   5         6
                59.84          3.61        1.5457    4   4   4         6
                61.08          3.43        1.5171    1   4   5         6
                61.08          3.76        1.5171    4   1   5         6
                61.43          8.11        1.5093    6   6   0         6
                63.44          1.67        1.4662    1  10   1         6
                63.59          1.28        1.4631    2   8   3         6
                63.59          1.10        1.4631    8   2   3         6
                65.68          1.85        1.4215    6   6   2         6
                66.27          1.06        1.4103    0   0   6         1
                66.64          2.08        1.4035    2   5   5         6
                66.64          1.10        1.4035    5   2   5         6
                72.29          3.27        1.3071   12   0   0         6
                76.24          1.14        1.2488   12   0   2         6
                76.79          5.19        1.2412    6   0   6         6
                77.14          1.87        1.2365    5   5   5         6
                79.64          1.59        1.2039    4  10   2         6
                79.64          1.98        1.2039   10   4   2         6
                81.93          1.34        1.1759    7   7   3         6
                82.20          1.62        1.1727    7   4   5         6
                84.44          1.13        1.1472   10   4   3         6
                87.21          1.38        1.1178    1  10   5         6
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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.