Pb(Al,Si)4O8
      Downs R T, Hazen R M, Finger L W
      American Mineralogist 80 (1995) 937-940
      Crystal chemistry of lead aluminosilicate hollandite: A new high-pressure
      synthetic phase with octahedral Si
      _database_code_amcsd 0001757

      CELL PARAMETERS:    9.4140   9.4140   2.7500   90.000   90.000   90.000
      SPACE GROUP: I4        
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    243.714
      Density (g/cm3):      9.456
      MAX. ABS. INTENSITY / VOLUME**2:      799.8430421    
      RIR:     27.543
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                13.30        100.00        6.6567    1   1   0         4
                18.85         39.28        4.7070    2   0   0         4
                26.79         22.74        3.3284    2   2   0         4
                30.02         21.87        2.9770    1   3   0         4
                30.02         18.51        2.9770    3   1   0         4
                33.96         17.96        2.6397    1   0   1         4
                38.24          3.33        2.3535    4   0   0         4
                39.13          6.92        2.3024    2   1   1         4
                39.13         12.88        2.3024    1   2   1         4
                40.66          4.44        2.2189    3   3   0         4
                42.97          5.36        2.1050    2   4   0         4
                42.97          3.43        2.1050    4   2   0         4
                43.77         12.12        2.0682    3   0   1         4
                48.05          4.35        1.8935    3   2   1         4
                48.05          3.22        1.8935    2   3   1         4
                49.36          1.03        1.8462    1   5   0         4
                49.36          2.91        1.8462    5   1   0         4
                52.06          4.16        1.7567    4   1   1         4
                52.06          1.01        1.7567    1   4   1         4
                55.19          1.15        1.6642    4   4   0         4
                58.86          2.22        1.5690    6   0   0         4
                59.50          1.05        1.5536    4   3   1         4
                63.01          2.22        1.4753    2   5   1         4
                69.85          1.30        1.3466    1   1   2         4
                71.48          1.08        1.3198    2   0   2         4
                72.97          1.12        1.2966    5   4   1         4
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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.