Demartinite
      Gramaccioli C M, Campostrini I
      The Canadian Mineralogist 45 (2007) 1275-1280
      Demartinite, a new polymorph of K2SiF6 from La Fossa Crater, Vulcano,
      Aeolian Islands, Italy
      Locality: La Fossa Crater, Vulcano Island, Aeolian Archipelago, Sicily, Italy
      _database_code_amcsd 0006157

      CELL PARAMETERS:    5.6461   5.6461   9.2322   90.000   90.000  120.000
      SPACE GROUP: P6_3mc    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    254.878
      Density (g/cm3):      2.870
      MAX. ABS. INTENSITY / VOLUME**2:      14.72092939    
      RIR:      1.670
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.14          7.81        4.8897    1   0   0         6
                19.23         18.91        4.6161    0   0   2         1
                20.55         52.74        4.3210    1   0   1         6
                26.56         67.45        3.3566    1   0   2         6
                31.70         42.97        2.8231    1   1   0         6
                34.43         14.56        2.6045    1   0   3         6
                36.76          3.88        2.4448    2   0   0         6
                38.08         30.49        2.3634    2   0   1         6
                39.03         23.58        2.3080    0   0   4         1
                41.81        100.00        2.1605    2   0   2         6
                43.35          6.67        2.0872    1   0   4         6
                47.50         30.64        1.9143    2   0   3         6
                50.35          1.32        1.8122    2   1   1        12
                51.12          3.96        1.7869    1   1   4         6
                53.01          2.08        1.7274    1   0   5         6
                53.40          5.43        1.7157    2   1   2        12
                54.69          3.34        1.6783    2   0   4         6
                56.46          4.07        1.6299    3   0   0         6
                57.41          2.42        1.6051    3   0   1         6
                58.23         10.09        1.5844    2   1   3        12
                63.10         11.56        1.4734    2   0   5         6
                63.37          1.80        1.4677    1   0   6         6
                64.60          5.94        1.4426    2   1   4        12
                64.72          3.13        1.4403    3   0   3         6
                66.21         15.98        1.4115    2   2   0         6
                69.59          5.57        1.3510    1   1   6         6
                69.66          1.19        1.3498    2   2   2         6
                70.14          1.25        1.3418    3   1   1        12
                70.77          1.04        1.3314    3   0   4         6
                72.34          7.72        1.3062    2   1   5        12
                72.60          3.56        1.3023    2   0   6         6
                72.67          6.00        1.3012    3   1   2        12
                76.81          2.99        1.2410    3   1   3        12
                79.61          4.08        1.2042    2   2   4         6
                81.44          4.08        1.1817    4   0   2         6
                83.23          2.01        1.1608    2   0   7         6
                85.47          2.35        1.1361    4   0   3         6
                86.69          1.72        1.1232    1   0   8         6
                87.10          2.93        1.1189    3   0   6         6
                89.71          1.63        1.0930    3   1   5        12
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.