Pyracmonite
      Demartin F, Gramaccioli C M, Campostrini I
      The Canadian Mineralogist 48 (2010) 307-313
      Pyracmonite, (NH4)3Fe(SO4)3, a new ammonium iron sulfate
      from La Fossa crater, Vulcano, Aeolian Islands, Italy
      Locality: La Fossa crater, Vulcano, Aeolian Islands, Italy
      _database_code_amcsd 0006332

      CELL PARAMETERS:   15.2171  15.2171   8.9323   90.000   90.000  120.000
      SPACE GROUP: R3c       
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   1791.256
      Density (g/cm3):      2.244
      MAX. ABS. INTENSITY / VOLUME**2:      21.11185038    
      RIR:      3.064
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                11.63        100.00        7.6086    1   1   0         6
                20.22          7.78        4.3928    3   0   0         3
                20.41         24.08        4.3503    2   1   1         6
                21.00          6.29        4.2298    0   1   2         3
                24.07          4.43        3.6970    2   0   2         3
                26.35         43.72        3.3828    1   3   1         6
                26.81         44.65        3.3252    1   2   2         6
                31.10          4.06        2.8758    4   1   0         6
                31.23          9.72        2.8637    3   2   1         6
                31.63         18.70        2.8286    3   1   2         6
                32.29          8.80        2.7727    1   1   3         6
                33.81          5.05        2.6513    0   4   2         3
                35.87          5.13        2.5036    2   3   2         6
                37.49          1.06        2.3990    2   4   1         6
                38.39          2.42        2.3447    2   2   3         6
                39.38          4.02        2.2879    5   1   1         6
                39.71          2.69        2.2699    5   0   2         3
                40.99          1.28        2.2017    1   0   4         3
                41.10          4.49        2.1964    6   0   0         3
                41.52          1.03        2.1752    4   2   2         6
                42.76          1.75        2.1149    0   2   4         3
                42.86          3.52        2.1102    5   2   0         6
                43.26          5.65        2.0914    1   5   2         6
                46.59          1.55        1.9493    3   4   2         6
                47.73          1.71        1.9056    1   3   4         6
                49.48          1.45        1.8422    3   5   1         6
                50.83          1.70        1.7962    3   2   4         6
                51.01          1.23        1.7904    6   2   1         6
                52.42          3.94        1.7455    7   1   0         6
                52.77          1.89        1.7348    5   3   2         6
                53.20          2.45        1.7217    2   5   3         6
                53.20          1.63        1.7217    5   2   3         6
                53.81          2.96        1.7038    0   5   4         3
                54.23          1.54        1.6914    2   6   2         6
                55.25          1.50        1.6626    2   4   4         6
                56.67          4.10        1.6243    5   1   4         6
                57.49          2.01        1.6030    4   4   3         6
                58.47          1.12        1.5784    4   5   2         6
                59.44          1.22        1.5550    4   3   4         6
                62.14          1.82        1.4938    1   6   4         6
                64.77          1.12        1.4394    7   0   4         3
                65.15          1.99        1.4319    6   4   2         6
                66.29          1.04        1.4099    3   0   6         3
                66.44          1.03        1.4072    3   7   2         6
                67.57          1.28        1.3863    2   2   6         6
                71.48          1.52        1.3198    9   1   2         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.