Ponomarevite
      Semenova T F, Rozhdestvenskaya I V, Filatov S K, Verasova L P
      Doklady Akademii Nauk SSSR 304 (1989) 427-430
      Crystal structure of a new mineral ponomarevite, K4Cu4OCl10
      Locality: the main Tolbachik fissure eruption (1975-76), Kamchatka
      _database_code_amcsd 0012479

      CELL PARAMETERS:   14.7400  14.9000   8.9480   90.000  104.790   90.000
      SPACE GROUP: C2/c      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   1900.102
      Density (g/cm3):      2.730
      MAX. ABS. INTENSITY / VOLUME**2:      1.842998186    
      RIR:      0.220
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                 8.59         10.44       10.2990    1   1   0         4
                11.88         72.31        7.4500    0   2   0         2
                12.09        100.00        7.3231   -1   1   1         4
                12.42         53.92        7.1258    2   0   0         2
                14.54         36.92        6.0938    1   1   1         4
                17.22          8.86        5.1495    2   2   0         4
                18.35          2.90        4.8343   -2   2   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.