Perhamite
      Mills S, Mumme G, Grey I, Bordet P
      Mineralogical Magazine 70 (2006) 201-209
      The crystal structure of perhamite
      Note: H positions unknown
      Locality: Emmons mine, Greenwood, Maine
      _database_code_amcsd 0014576

      CELL PARAMETERS:    7.0210   7.0210  20.2180   90.000   90.000  120.000
      SPACE GROUP: P-3m1     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    863.111
      Density (g/cm3):      2.535
      MAX. ABS. INTENSITY / VOLUME**2:      18.49111258    
      RIR:      2.375
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                 4.37        100.00       20.2180    0   0   1         2
                 8.75          2.27       10.1090    0   0   2         2
                13.14          4.45        6.7393    0   0   3         2
                14.57         30.03        6.0804    1   0   0         6
                15.22         26.88        5.8227    0   1   1         6
                15.22          6.14        5.8227    1   0   1         6
                17.02          3.98        5.2105    1   0   2         6
                17.55          1.02        5.0545    0   0   4         2
                19.66          1.25        4.5145    0   1   3         6
                25.37         13.42        3.5105    1   1   0         6
                25.76          3.80        3.4587    1   1   1        12
                26.47          2.17        3.3670    1   0   5         6
                26.88          1.25        3.3162    1   1   2        12
                28.67         15.24        3.1134    1   1   3        12
                29.72          9.01        3.0064    0   2   1         6
                30.33          3.39        2.9473    0   1   6         6
                30.33          4.14        2.9473    1   0   6         6
                30.71          9.00        2.9114    0   2   2         6
                30.96          1.11        2.8883    0   0   7         2
                31.02         27.92        2.8833    1   1   4        12
                32.30          1.81        2.7713    0   2   3         6
                32.30         10.84        2.7713    2   0   3         6
                33.81          7.43        2.6509    1   1   5        12
                34.37          2.67        2.6089    1   0   7         6
                34.42          2.51        2.6052    2   0   4         6
                35.52          2.26        2.5273    0   0   8         2
                36.98          3.67        2.4310    1   1   6        12
                38.58          3.17        2.3337    1   0   8         6
                39.94          2.97        2.2573    0   2   6         6
                39.94          4.09        2.2573    2   0   6         6
                40.14          2.08        2.2464    0   0   9         2
                40.24          3.22        2.2410    1   2   2        12
                41.52          2.66        2.1752    1   2   3        12
                42.92          7.63        2.1072    1   0   9         6
                43.25          1.14        2.0921    1   2   4        12
                44.16          2.56        2.0510    1   1   8        12
                45.39          2.02        1.9980    2   1   5        12
                46.81          5.95        1.9409    0   3   3         6
                47.39          1.99        1.9185    1   0  10         6
                48.39          8.58        1.8812    0   3   4         6
                49.60          1.85        1.8380    0   0  11         2
                50.36          2.00        1.8119    0   3   5         6
                52.11         17.90        1.7552    2   2   0         6
                57.36          1.62        1.6064    1   2   9        12
                61.00          2.20        1.5190    1   1  12        12
                61.04          1.01        1.5180    2   1  10        12
                61.85          1.41        1.5000    2   2   7        12
                62.65          2.43        1.4828    0   4   3         6
                63.08          5.10        1.4737    0   2  12         6
                63.92          1.21        1.4563    3   1   7        12
                64.65          2.38        1.4417    2   2   8        12
                67.67          2.84        1.3846    0   2  13         6
                67.75          1.28        1.3831    2   2   9        12
                71.04          1.61        1.3268    4   1   0        12
                73.03          1.33        1.2956    0   3  12         6
                73.84          1.10        1.2834    1   4   4        12
                73.84          1.89        1.2834    4   1   4        12
                81.16          2.38        1.1851    3   2   9        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.