Perrierite-(La)
      Chukanov N V, Blass G, Pekov I V, Belakovskiy D I, Van K V,
      Rastsvetaeva R K, Aksenov S M
      Zapiski Rossiiskogo Mineralogicheskogo Obshchetstva 140 (2011) 34-44
      Perrierite-(La) (La,Ce,Ca)4Fe2+(Ti,Fe)4(Si2O7)2O8 - a new mineral
      species from volcanic region Eifel, Germany
      Locality: Dellen pumice quarry, Eifel Mountains, Rhineland-Palatinate, Germany
      _database_code_amcsd 0019036

      CELL PARAMETERS:   13.6680   5.6601  11.7430   90.000  113.640   90.000
      SPACE GROUP: P2_1/a    
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    832.229
      Density (g/cm3):      4.882
      MAX. ABS. INTENSITY / VOLUME**2:      30.98036730    
      RIR:      2.066
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                 8.22         18.79       10.7576    0   0   1         2
                13.21          7.31        6.7044   -2   0   1         2
                14.15          3.13        6.2605    2   0   0         2
                16.48         14.53        5.3788    0   0   2         2
                17.19         24.29        5.1576    1   1   0         4
                17.80          5.18        4.9826   -1   1   1         4
                20.29          2.13        4.3774    1   1   1         4
                21.82         25.01        4.0740   -1   1   2         4
                23.12          2.68        3.8473   -2   0   3         2
                24.83         13.63        3.5859    0   0   3         2
                25.09         26.72        3.5489   -3   1   1         4
                25.83         20.52        3.4490    1   1   2         4
                26.36          6.23        3.3814   -3   1   2         4
                27.86          3.94        3.2025   -1   1   3         4
                28.51         21.08        3.1303    4   0   0         2
                29.40         27.30        3.0376   -4   0   3         2
                30.01         88.71        2.9774   -3   1   3         4
                30.33        100.00        2.9472    3   1   1         4
                30.46          4.51        2.9343   -2   0   4         2
                31.61         40.98        2.8300    0   2   0         2
                32.69          3.45        2.7397    1   1   3         4
                32.72          4.07        2.7369    0   2   1         4
                32.85         12.23        2.7266    4   0   1         2
                33.32         41.02        2.6894    0   0   4         2
                34.15          7.14        2.6257   -4   0   4         2
                34.40          7.04        2.6073   -2   2   1         4
                34.79          1.80        2.5788    2   2   0         4
                34.99         10.22        2.5646   -1   1   4         4
                35.79          5.29        2.5086    3   1   2         4
                35.85         15.04        2.5045    0   2   2         4
                36.05          9.89        2.4913   -2   2   2         4
                36.58          8.03        2.4566   -5   1   2         4
                37.02          1.21        2.4286   -5   1   1         4
                37.17          1.63        2.4188    2   2   1         4
                38.65          3.29        2.3297    4   0   2         2
                39.53          1.08        2.2797   -2   2   3         4
                39.57          4.58        2.2778   -6   0   2         2
                40.23          9.08        2.2416   -4   0   5         2
                40.60          4.93        2.2220   -6   0   1         2
                40.61          6.04        2.2215    0   2   3         4
                41.55         24.42        2.1732   -4   2   1         4
                41.77         11.76        2.1625   -4   2   2         4
                41.92         11.43        2.1550   -3   1   5         4
                42.39         10.83        2.1321    3   1   3         4
                42.78          1.30        2.1136   -1   1   5         4
                42.90          3.84        2.1082   -6   0   4         2
                43.09          6.78        2.0993    4   2   0         4
                43.36          3.42        2.0868    6   0   0         2
                43.72          6.88        2.0706   -4   2   3         4
                46.09          1.11        1.9693   -5   1   5         4
                46.23          2.83        1.9635    4   2   1         4
                46.59         32.46        1.9495    0   2   4         4
                46.66         10.36        1.9467    2   2   3         4
                46.95          1.18        1.9352   -6   0   5         2
                47.22          2.45        1.9248   -4   2   4         4
                48.59          2.55        1.8739    5   1   2         4
                49.50          8.36        1.8412   -7   1   2         4
                49.64          9.03        1.8365   -7   1   3         4
                49.80          2.90        1.8309    3   1   4         4
                50.05          1.29        1.8225    2   0   5         2
                50.56          8.77        1.8052   -2   2   5         4
                50.76          1.61        1.7986    4   2   2         4
                50.83          3.56        1.7962   -1   3   2         4
                50.90          3.39        1.7940   -7   1   1         4
                51.10          7.51        1.7876   -1   1   6         4
                51.30          2.58        1.7809   -7   1   4         4
                51.50          2.72        1.7744   -6   2   2         4
                51.98          6.55        1.7592   -5   1   6         4
                52.04          3.29        1.7572   -4   2   5         4
                52.15          2.90        1.7539   -6   2   3         4
                52.26          2.94        1.7504   -6   0   6         2
                52.35          9.73        1.7477   -6   2   1         4
                52.50          3.38        1.7431   -3   3   1         4
                52.90          2.78        1.7309    1   3   2         4
                53.05          6.75        1.7262    4   0   4         2
                53.06          5.53        1.7261    6   0   2         2
                53.11          1.10        1.7245    2   2   4         4
                53.50          1.41        1.7128    0   2   5         4
                53.69          6.72        1.7072   -8   0   3         2
                54.06          2.87        1.6963   -8   0   2         2
                54.26          6.15        1.6907   -6   2   4         4
                54.64          3.92        1.6796    6   2   0         4
                55.00          4.69        1.6695   -4   0   7         2
                55.31         12.47        1.6609   -3   3   3         4
                55.50         12.22        1.6556    3   3   1         4
                55.87          2.01        1.6457   -8   0   1         2
                56.43          1.79        1.6305    4   2   3         4
                57.11          2.85        1.6129    1   1   6         4
                57.24          1.34        1.6094   -8   0   5         2
                57.32          5.97        1.6075   -3   1   7         4
                57.56          1.03        1.6013   -2   2   6         4
                57.71          3.28        1.5974   -6   2   5         4
                57.88         10.43        1.5932    3   1   5         4
                57.89          7.51        1.5930    7   1   1         4
                58.50          1.48        1.5777   -1   3   4         4
                58.74          3.90        1.5718   -7   1   6         4
                58.82          2.76        1.5700   -5   1   7         4
                59.05          1.15        1.5644    3   3   2         4
                59.52          1.29        1.5531    6   0   3         2
                59.59          1.64        1.5515   -5   3   2         4
                60.22          3.25        1.5368    0   0   7         2
                61.01          1.46        1.5188   -8   0   6         2
                61.20          3.01        1.5146    0   2   6         4
                63.08          1.85        1.4737    4   2   4         4
                63.18          1.31        1.4717    7   1   2         4
                63.39          1.20        1.4673    8   0   1         2
                63.40          1.30        1.4672   -4   0   8         2
                63.43          2.82        1.4664   -3   3   5         4
                63.79          3.07        1.4591    3   3   3         4
                63.95          1.19        1.4559   -9   1   4         4
                64.22          2.99        1.4503   -7   1   7         4
                64.84          1.72        1.4380   -4   2   7         4
                65.35          3.17        1.4279   -2   2   7         4
                65.63          3.33        1.4226   -8   2   1         4
                65.93          1.28        1.4167   -8   0   7         2
                66.02         11.30        1.4150    0   4   0         2
                66.58          1.74        1.4046    3   1   6         4
                66.88          4.16        1.3990   -8   2   5         4
                68.97          5.39        1.3616    6   2   3         4
                69.23          1.81        1.3571   -1   1   8         4
                69.36          2.39        1.3550   -7   3   2         4
                69.47          2.22        1.3531   -7   3   3         4
                69.59          2.35        1.3510    9   1   0         4
                69.96          4.06        1.3447    0   0   8         2
                69.98          1.19        1.3443  -10   0   2         2
                70.35          2.79        1.3383   -8   2   6         4
                70.50          1.24        1.3358   -7   3   1         4
                70.66          1.96        1.3331   -1   3   6         4
                71.39          2.59        1.3212   -5   3   6         4
                72.57          1.40        1.3026    8   2   1         4
                72.74          1.35        1.3000  -10   0   6         2
                73.44          2.07        1.2894    4   4   0         4
                73.89          2.62        1.2827   -4   4   3         4
                74.87          4.11        1.2682   -6   2   8         4
                74.97          1.05        1.2669   -8   2   7         4
                75.30          1.39        1.2621   -3   1   9         4
                75.73          1.35        1.2560    4   4   1         4
                75.85          3.48        1.2543    6   2   4         4
                75.93          2.05        1.2532   -3   3   7         4
                75.95          1.19        1.2529    3   1   7         4
                75.99          5.70        1.2523    0   4   4         4
                76.41          3.69        1.2464    3   3   5         4
                76.42          2.67        1.2463    7   3   1         4
                76.47          1.06        1.2456   -4   4   4         4
                77.17          1.26        1.2361   -7   3   6         4
                77.75          1.92        1.2283  -10   2   4         4
                78.80          2.99        1.2146    0   2   8         4
                78.90          2.31        1.2133  -11   1   4         4
                79.75          1.26        1.2025  -11   1   5         4
                79.79          1.15        1.2020   -6   4   2         4
                80.22          1.11        1.1966   -4   4   5         4
                80.79          3.22        1.1896  -11   1   2         4
                81.19          2.55        1.1847   -4   2   9         4
                81.79          2.17        1.1776  -11   1   6         4
                82.06          1.21        1.1743   -7   3   7         4
                84.64          1.68        1.1450   10   2   0         4
                85.01          3.57        1.1410    7   1   5         4
                85.09          1.24        1.1401  -10   2   7         4
                86.13          1.63        1.1290    3   1   8         4
                86.61          1.49        1.1240   10   0   2         2
                87.02          1.31        1.1197    9   3   0         4
                87.39          1.40        1.1159   11   1   0         4
                87.48          1.78        1.1150   -8   2   9         4
                89.37          1.48        1.0963  -11   1   8         4
                89.57          2.14        1.0943    4   4   4         4
                89.58          1.74        1.0943    6   4   2         4
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.