Laurentianite
      Haring M M M, McDonald A M, Cooper M A, Poirier G A
      The Canadian Mineralogist 50 (2012) 1265-1280
      Laurentianite, [NbO(H2O)]3(Si2O7)2[Na(H2O)2]3, a new mineral from Mont
      Saint-Hilaire, Quebec: description, crystal-structure determination and paragenesis
      Locality: Mont Saint-Hilaire, Quebec, Canada
      _database_code_amcsd 0019711

      CELL PARAMETERS:    9.9370   9.9370   7.0040   90.000   90.000  120.000
      SPACE GROUP: P3        
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    598.946
      Density (g/cm3):      2.517
      MAX. ABS. INTENSITY / VOLUME**2:      35.10855921    
      RIR:      4.541
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                10.28        100.00        8.6057    1   0   0         3
                12.64         21.93        7.0040    0   0   1         1
                16.32          4.99        5.4322    0   1   1         3
                16.32          4.98        5.4322    1   0   1         3
                20.64         21.62        4.3028    2   0   0         3
                21.93          1.87        4.0524    2  -1   1         3
                21.93          9.51        4.0524    1   1   1         3
                24.28         16.92        3.6663    0   2   1         3
                24.28         16.97        3.6663    2   0   1         3
                25.43          7.89        3.5020    0   0   2         1
                27.42         14.26        3.2526    1   2   0         3
                27.42         14.32        3.2526    2   1   0         3
                31.18          3.12        2.8686    3   0   0         3
                31.25         17.65        2.8624    2  -1   2         3
                31.25         12.75        2.8624    1   1   2         3
                32.98          8.90        2.7161    2   0   2         3
                32.98          8.87        2.7161    0   2   2         3
                36.16          7.73        2.4843    2   2   0         3
                38.45          1.88        2.3413    2   2   1         3
                42.00          5.67        2.1514    4   0   0         3
                42.80          3.86        2.1130    1   1   3         3
                44.13          1.24        2.0521    2   0   3         3
                44.13          1.22        2.0521    0   2   3         3
                44.73          2.32        2.0262    2   2   2         3
                44.73          1.24        2.0262    4  -2   2         3
                45.97          2.51        1.9743    2   3   0         3
                45.97          2.52        1.9743    3   2   0         3
                49.74          9.33        1.8331    0   4   2         3
                49.74          9.34        1.8331    4   0   2         3
                52.24          3.43        1.7510    0   0   4         1
                53.89          1.52        1.7013    2   2   3         3
                56.76          1.39        1.6219    2   0   4         3
                56.76          1.38        1.6219    0   2   4         3
                59.84          1.54        1.5456    1   5   0         3
                59.84          1.54        1.5456    5   1   0         3
                61.98          1.45        1.4972    3   3   2         3
                65.03          1.10        1.4343    6   0   0         3
                65.18          1.77        1.4312    2   2   4         3
                65.18          1.94        1.4312    4  -2   4         3
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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.