Jankovicite
      Libowitzky E, Giester G, Tillmanns E
      European Journal of Mineralogy 7 (1995) 479-487
      The crystal structure of jankovicite, Tl5Sb9(As,Sb)4S22
      _database_code_amcsd 0006589

      CELL PARAMETERS:    7.3930   8.7110  17.5800  103.810   91.810  109.510
      SPACE GROUP: P-1       
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   1028.616
      Density (g/cm3):      5.121
      MAX. ABS. INTENSITY / VOLUME**2:      19.97637412    
      RIR:      1.270
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                 5.22          2.15       16.9451    0   0   1         2
                10.44          1.08        8.4726    0   0   2         2
                11.17          2.48        7.9183    0   1   0         2
                12.80          1.42        6.9168    1   0   0         2
                13.13          3.11        6.7431    0  -1   2         2
                13.54          2.04        6.5406    0   1   1         2
                13.72          8.35        6.4546   -1   1   0         2
                14.18          1.72        6.2480    1  -1   1         2
                14.41          6.70        6.1476    1   0   1         2
                15.18          9.44        5.8367   -1   1   1         2
                15.52          9.58        5.7089   -1   0   2         2
                15.69          3.66        5.6484    0   0   3         2
                16.39          5.06        5.4077    1  -1   2         2
                16.69         31.29        5.3103    0  -1   3         2
                17.23         23.09        5.1457    0   1   2         2
                19.04          1.93        4.6615   -1   0   3         2
                19.28          2.18        4.6046   -1  -1   1         2
                19.80          9.43        4.4838    1  -1   3         2
                20.17         14.54        4.4025   -1  -1   2         2
                20.97         13.28        4.2363    0   0   4         2
                21.00         25.29        4.2296    0  -1   4         2
                21.15         16.97        4.2006    1  -2   1         2
                21.49          2.70        4.1355    1   0   3         2
                21.59         23.56        4.1169   -1   2   0         2
                21.61          4.92        4.1126    0   1   3         2
                21.62         18.24        4.1099    1   1   1         2
                21.66         71.57        4.1033    0  -2   1         2
                21.94         52.01        4.0505   -1   1   3         2
                22.01         19.47        4.0387    1  -2   2         2
                22.13         12.60        4.0176    0  -2   2         2
                22.31          2.17        3.9845   -1  -1   3         2
                22.46         46.05        3.9591    0   2   0         2
                23.25         10.30        3.8265   -1   2   1         2
                23.25          3.37        3.8257   -1   0   4         2
                23.79          5.90        3.7403    0  -2   3         2
                23.92         40.81        3.7203    1  -1   4         2
                24.03          4.77        3.7035    1  -2   3         2
                24.40          7.36        3.6474    0   2   1         2
                24.73          1.04        3.6006   -2   1   1         2
                25.40         27.36        3.5061   -1  -1   4         2
                25.66         24.52        3.4723   -2   0   1         2
                25.76         59.54        3.4584    2   0   0         2
                25.91          8.62        3.4390   -1   2   2         2
                26.30        100.00        3.3890    0   0   5         2
                26.32         24.63        3.3864   -1   1   4         2
                26.34         28.50        3.3830   -2   1   2         2
                26.44         14.93        3.3716    0  -2   4         2
                26.47          8.49        3.3671    2  -1   2         2
                26.63         21.98        3.3475   -2   0   2         2
                26.97         12.82        3.3063    1  -2   4         2
                27.27          7.08        3.2703    0   2   2         2
                27.60         27.54        3.2316    2  -2   1         2
                27.64          8.53        3.2273   -2   2   0         2
                27.87          1.88        3.2010   -1   0   5         2
                28.09         59.32        3.1766    1   1   3         2
                28.47          1.07        3.1353    1  -1   5         2
                28.57          5.16        3.1240    2  -2   2         2
                28.58          9.81        3.1234   -2   0   3         2
                28.68         16.45        3.1124   -2   2   1         2
                28.78         15.00        3.1021   -1  -2   1         2
                28.85          6.35        3.0949   -1  -2   2         2
                28.87          1.61        3.0922   -2   1   3         2
                29.05         38.33        3.0740    2  -1   3         2
                29.05         20.74        3.0738    2   0   2         2
                29.17         17.90        3.0618   -1  -1   5         2
                29.32         24.97        3.0460   -1   2   3         2
                29.68         11.35        3.0097    1   2   0         2
                29.82         54.63        2.9957    0  -2   5         2
                29.88          6.20        2.9900   -1  -2   3         2
                30.46         52.76        2.9343    2  -2   3         2
                30.58          9.61        2.9234    1  -2   5         2
                30.63         60.65        2.9183   -2   2   2         2
                30.76          1.91        2.9069    1   0   5         2
                30.82          4.64        2.9013    0   2   3         2
                30.93          1.29        2.8913    1  -3   1         2
                31.37          4.94        2.8514   -2  -1   2         2
                31.48         26.70        2.8416    1   2   1         2
                31.68          1.99        2.8242    0   0   6         2
                31.80         40.87        2.8142   -1  -2   4         2
                31.94         40.49        2.8016    2   0   3         2
                32.12          8.37        2.7869   -2   1   4         2
                32.21          1.04        2.7789    1   1   4         2
                32.33          3.43        2.7692    2  -1   4         2
                32.57          8.59        2.7491   -2  -1   3         2
                32.76          4.54        2.7337    0  -3   2         2
                33.13          1.58        2.7038    2  -2   4         2
                33.28         10.80        2.6922   -1   2   4         2
                33.30          1.01        2.6903    1  -1   6         2
                33.35          8.77        2.6864   -2   2   3         2
                33.42          9.98        2.6809   -1   3   1         2
                33.76         29.71        2.6551    0  -2   6         2
                33.85         16.39        2.6481    1  -3   4         2
                34.05          5.80        2.6329    1   2   2         2
                34.25          3.58        2.6184    2  -3   1         2
                34.46          3.15        2.6024   -1  -2   5         2
                34.58          2.63        2.5941   -2  -1   4         2
                34.68         18.31        2.5863    1  -2   6         2
                34.74         39.33        2.5826   -2   0   5         2
                34.87         37.94        2.5728    0   2   4         2
                34.98          4.08        2.5654    0  -3   4         2
                35.38         12.32        2.5370    2   1   2         2
                35.45          8.79        2.5324    2   0   4         2
                35.73          2.92        2.5129    2  -3   3         2
                35.79          5.72        2.5090    0   3   1         2
                35.85         10.51        2.5052   -1   3   2         2
                36.06          3.88        2.4905   -2   3   1         2
                36.43          2.96        2.4664    2  -2   5         2
                36.50          1.93        2.4619    0   1   6         2
                36.69          6.35        2.4494   -2   2   4         2
                36.71          2.88        2.4481    1   1   5         2
                37.14          4.77        2.4207    0   0   7         2
                37.21          2.45        2.4162    3  -1   1         2
                37.23          2.03        2.4150    0  -3   5         2
                37.61         27.60        2.3917   -3   2   0         2
                37.62          1.57        2.3912   -3   1   2         2
                37.63          5.25        2.3901    2  -3   4         2
                37.64         10.52        2.3896   -1   2   5         2
                37.74          1.32        2.3837   -1  -2   6         2
                38.10          8.84        2.3620    0  -2   7         2
                38.11          1.26        2.3613   -2   3   2         2
                38.18          1.16        2.3572   -3   2   1         2
                38.28          5.74        2.3513    2   1   3         2
                38.36          3.11        2.3468    1  -1   7         2
                38.62          3.25        2.3312    3  -1   2         2
                38.63         21.18        2.3307   -2   0   6         2
                38.77          1.80        2.3226   -3   0   1         2
                38.78          5.45        2.3223    3  -2   2         2
                38.89          1.83        2.3155   -1   3   3         2
                39.13         30.49        2.3023   -2  -2   2         2
                39.16         10.04        2.3004    1  -2   7         2
                39.18          4.47        2.2995   -1  -3   2         2
                39.27          5.51        2.2940   -3   1   3         2
                39.30          2.26        2.2927   -2  -2   1         2
                39.30         10.38        2.2924    0   2   5         2
                39.42         31.80        2.2856    2   0   5         2
                39.55          2.96        2.2788   -1  -3   1         2
                39.55          2.56        2.2785   -1  -3   3         2
                39.57          6.81        2.2778    1  -3   6         2
                39.70          1.22        2.2702   -2  -2   3         2
                40.20          3.49        2.2432    2  -3   5         2
                40.21          2.82        2.2428    2   2   0         2
                40.23          1.63        2.2419    2  -2   6         2
                40.46          2.43        2.2295    3  -2   3         2
                40.66         10.75        2.2190   -1  -3   4         2
                40.72          1.54        2.2156    3  -1   3         2
                40.80          1.59        2.2116   -2   3   3         2
                41.00          3.89        2.2013   -2  -2   4         2
                41.49          2.49        2.1762   -3   2   3         2
                41.50         63.97        2.1758    1  -4   2         2
                41.81          1.13        2.1607    0   1   7         2
                41.82          4.46        2.1601    2   2   1         2
                42.27          4.15        2.1381    3  -3   2         2
                42.32          3.22        2.1356   -1   2   6         2
                42.43          9.35        2.1302    1   3   1         2
                42.46          3.32        2.1289   -1   3   4         2
                42.76          2.30        2.1148    0  -2   8         2
                42.91         11.53        2.1077   -3   3   1         2
                42.92         22.16        2.1072   -2   0   7         2
                42.97          3.02        2.1050   -2  -2   5         2
                43.07          4.12        2.1003    2  -4   2         2
                43.18          1.73        2.0949    2  -4   1         2
                43.43          1.02        2.0835    3  -1   4         2
                43.59          3.61        2.0764    1  -1   8         2
                43.64          2.25        2.0740    2  -4   3         2
                43.98          1.93        2.0588   -3  -1   1         2
                44.11          1.12        2.0533   -3   2   4         2
                44.66          3.06        2.0290    0  -4   1         2
                44.75          3.97        2.0252   -2   2   6         2
                44.84          4.29        2.0214    1   3   2         2
                44.86          3.74        2.0206   -1  -3   6         2
                44.96          1.58        2.0164    2  -1   7         2
                45.02          2.64        2.0138    0   3   4         2
                45.28          5.40        2.0027    3  -3   4         2
                45.45          1.18        1.9956   -2   4   1         2
                45.69          3.80        1.9858    3  -2   5         2
                45.69          1.66        1.9858   -1  -2   8         2
                45.94         10.09        1.9754    3   1   1         2
                46.07          6.68        1.9700   -3  -1   4         2
                46.33          1.43        1.9597    1   0   8         2
                46.46          2.35        1.9546   -1   3   5         2
                46.47          9.52        1.9543   -1   1   8         2
                46.53          4.79        1.9516    0  -1   9         2
                46.61          1.77        1.9485    0  -4   5         2
                46.86          1.03        1.9388   -1   4   2         2
                46.88          4.54        1.9380    2   2   3         2
                46.94          3.07        1.9355    2  -3   7         2
                47.11          1.53        1.9290    3   0   4         2
                47.25          6.25        1.9238   -3   2   5         2
                47.26          1.13        1.9233   -1   2   7         2
                47.30          1.99        1.9219    1  -3   8         2
                47.39          2.28        1.9182    0  -3   8         2
                47.52          2.64        1.9132   -2   4   2         2
                47.53          1.56        1.9129   -2   0   8         2
                47.68          2.61        1.9072    0  -2   9         2
                47.70          1.98        1.9067    3  -3   5         2
                47.74          3.75        1.9051   -2   3   5         2
                47.79          1.72        1.9033    1   3   3         2
                47.80          1.18        1.9030   -3   0   6         2
                47.93          1.29        1.8979   -1  -1   9         2
                48.04          1.90        1.8938   -3  -1   5         2
                48.34          1.61        1.8828    0   0   9         2
                48.43          4.12        1.8796    3  -4   1         2
                48.45          2.33        1.8788    2   0   7         2
                48.46          1.96        1.8785   -2  -1   8         2
                48.51          9.23        1.8766    3  -4   2         2
                48.54          1.62        1.8754   -1   0   9         2
                48.62         11.85        1.8725   -2  -2   7         2
                48.69          1.06        1.8702    0  -4   6         2
                48.72          2.16        1.8692   -2  -3   2         2
                48.95          1.25        1.8608    1  -2   9         2
                48.97         11.78        1.8602    2  -2   8         2
                48.98          2.02        1.8598   -3   4   0         2
                48.99          4.72        1.8593    1  -1   9         2
                49.04          6.88        1.8577    0   3   5         2
                49.08          1.83        1.8562    3  -2   6         2
                49.21          6.00        1.8514   -2  -3   1         2
                49.31          6.87        1.8480   -2   2   7         2
                49.55          1.67        1.8398   -4   2   0         2
                49.56          5.24        1.8395    1   2   6         2
                49.60          2.80        1.8379   -2  -3   4         2
                49.70          8.92        1.8345   -1   4   3         2
                49.81          4.95        1.8306    2  -1   8         2
                49.82          1.89        1.8303   -4   2   1         2
                49.89          1.29        1.8278    4  -2   1         2
                49.90         14.44        1.8274    1  -4   7         2
                50.15          1.18        1.8190   -2   4   3         2
                50.19          2.13        1.8177    2   2   4         2
                50.20          4.57        1.8172   -1  -2   9         2
                50.33          1.98        1.8131   -4   1   2         2
                50.35          1.13        1.8123    3   1   3         2
                50.36          7.47        1.8119    3  -1   6         2
                50.42          2.08        1.8099   -1  -4   3         2
                50.46          3.95        1.8086   -1  -4   2         2
                50.54          1.58        1.8058    3  -4   4         2
                50.56          5.25        1.8053    4  -1   1         2
                50.71          7.01        1.8003   -4   2   2         2
                50.85          1.06        1.7956   -3   2   6         2
                50.85          3.45        1.7955    4  -2   2         2
                51.00          1.80        1.7908   -1  -4   4         2
                51.25          1.54        1.7826   -3  -2   2         2
                51.73          2.48        1.7672    1  -3   9         2
                51.77         12.93        1.7657    1   1   8         2
                51.84          1.90        1.7636   -2   3   6         2
                51.86          1.19        1.7632    1   0   9         2
                51.96          6.77        1.7598   -1   1   9         2
                52.04          2.42        1.7574   -4   3   0         2
                52.17          3.43        1.7533   -1  -4   5         2
                52.19          2.82        1.7526   -4   2   3         2
                52.36          4.27        1.7475    1   4   0         2
                52.40          3.73        1.7460    4  -2   3         2
                52.43          2.41        1.7453   -3  -2   4         2
                52.43          2.60        1.7451   -2   0   9         2
                52.44          3.35        1.7449    3  -4   5         2
                52.49          3.58        1.7434    3   2   0         2
                52.54          3.55        1.7418   -4   0   1         2
                52.64          1.22        1.7387   -4   3   1         2
                52.72          7.16        1.7361   -4   0   2         2
                52.85          4.57        1.7324    0  -2  10         2
                52.88          1.26        1.7315    0   1   9         2
                52.90          2.78        1.7307    3  -2   7         2
                52.90          2.08        1.7307    0   4   3         2
                52.95          3.23        1.7292    4   0   0         2
                52.96          1.37        1.7290   -2  -1   9         2
                53.20          3.64        1.7219   -4   1   4         2
                53.24          6.84        1.7206   -1  -1  10         2
                53.34          1.51        1.7175    3   1   4         2
                53.42          1.07        1.7152    0   3   6         2
                53.71          3.37        1.7065    4  -1   3         2
                53.80          1.18        1.7038    2  -2   9         2
                53.81          1.98        1.7036    4  -3   3         2
                53.89          2.28        1.7012   -3  -2   5         2
                53.95          3.14        1.6995    4   0   1         2
                54.04          1.17        1.6969    2  -5   4         2
                54.12         13.20        1.6945    0   0  10         2
                54.17          1.83        1.6932    1   4   1         2
                54.19          3.55        1.6924   -3   4   3         2
                54.34          1.47        1.6883    3   0   6         2
                54.50          1.18        1.6836    4  -2   4         2
                54.57          1.23        1.6817    1  -1  10         2
                54.59          1.03        1.6811   -2   5   0         2
                54.85          3.72        1.6738   -4   0   4         2
                54.87          1.91        1.6732    3  -4   6         2
                54.92          1.68        1.6718    2  -1   9         2
                55.10          2.08        1.6668   -1  -3   9         2
                55.50          3.61        1.6556   -1   3   7         2
                55.55          2.42        1.6543    4  -3   4         2
                55.58          4.09        1.6536   -4   3   3         2
                56.17          6.09        1.6376   -2   5   1         2
                56.19          4.41        1.6370   -1  -4   7         2
                56.22          3.39        1.6363    0  -3  10         2
                56.26          2.21        1.6352    0   4   4         2
                56.33          1.64        1.6332    1  -5   6         2
                56.34          2.19        1.6329   -3   3   6         2
                56.39          1.08        1.6317    0  -5   4         2
                56.51          1.40        1.6284    1   4   2         2
                56.79          3.07        1.6211    3   1   5         2
                56.95          1.11        1.6169    0  -5   1         2
                57.00          5.74        1.6158   -3   4   4         2
                57.22          5.57        1.6099    2  -5   6         2
                57.61          1.28        1.5999    4   0   3         2
                57.79          8.62        1.5953    3  -4   7         2
                58.03          2.67        1.5894    3  -5   4         2
                58.12          1.23        1.5871    0   3   7         2
                58.22          1.45        1.5847   -4   1   6         2
                58.28          3.64        1.5833   -2   5   2         2
                58.82          4.05        1.5698    0  -5   6         2
                58.91          1.02        1.5677    2  -2  10         2
                58.97          2.88        1.5664   -1  -4   8         2
                59.04          3.20        1.5646   -4  -1   4         2
                59.16          3.84        1.5617   -4   0   6         2
                59.25          1.20        1.5597   -3   5   1         2
                59.30          3.22        1.5583    1   3   6         2
                59.35          2.27        1.5572    1   4   3         2
                59.41          2.75        1.5558   -2  -4   3         2
                59.45          2.39        1.5547    3  -5   5         2
                59.70          1.59        1.5488    0   2   9         2
                59.75          1.26        1.5476    4   1   1         2
                59.82          2.76        1.5461   -4   2   6         2
                60.07          4.72        1.5403    2  -3  10         2
                60.10          7.10        1.5395    0   5   1         2
                60.25          3.46        1.5359    2   3   4         2
                60.26          2.39        1.5359   -3   4   5         2
                60.50          2.69        1.5302   -3   1   9         2
                60.65          3.12        1.5268    3   1   6         2
                60.79          2.40        1.5236   -3  -3   4         2
                60.84          1.10        1.5226    0  -5   7         2
                60.95          1.74        1.5202   -3  -3   1         2
                61.08          2.62        1.5173   -2   3   8         2
                61.11          1.42        1.5165    0  -3  11         2
                61.43          1.77        1.5093   -3  -2   8         2
                62.05          2.68        1.4957   -4   0   7         2
                62.10          3.49        1.4946    3  -3   9         2
                62.20          4.49        1.4925   -1  -4   9         2
                62.89          2.36        1.4779   -5   2   0         2
                62.91          1.11        1.4774    1   1  10         2
                63.00          1.70        1.4754   -2   0  11         2
                63.38          2.73        1.4675   -3  -3   6         2
                63.67          1.17        1.4615    3  -1   9         2
                63.72          3.47        1.4605    3   3   1         2
                63.80          1.19        1.4589    4   1   3         2
                63.88          3.99        1.4571    1   3   7         2
                63.92          2.42        1.4564   -1  -3  11         2
                63.95          1.21        1.4557   -3   2   9         2
                64.07          1.15        1.4534    2   0  10         2
                64.45          1.38        1.4456    2  -6   2         2
                64.49          1.04        1.4449   -1  -1  12         2
                64.76          2.87        1.4395   -4  -2   2         2
                64.86          1.39        1.4376    1   5   0         2
                64.90          1.71        1.4368    5  -3   2         2
                64.91          5.71        1.4366    1  -6   3         2
                65.04          1.69        1.4341    4  -5   4         2
                65.07          1.06        1.4335    3   2   5         2
                65.26          1.99        1.4297   -3  -1  10         2
                65.40          1.47        1.4270   -4   5   1         2
                65.86          1.04        1.4181   -1  -4  10         2
                66.30          2.54        1.4099    1  -1  12         2
                66.35          1.14        1.4089    1   4   5         2
                66.78          1.38        1.4008    4   0   6         2
                66.81          1.59        1.4002    3  -6   3         2
                67.09          1.06        1.3950    1  -6   6         2
                67.46          1.63        1.3883    5  -4   1         2
                67.60          1.58        1.3857   -5   4   0         2
                67.67          1.29        1.3846    4  -2   8         2
                67.83          1.61        1.3816    5  -4   2         2
                68.35          1.99        1.3724    3  -6   5         2
                68.36          1.54        1.3723   -3   6   0         2
                68.67          2.68        1.3668   -2   0  12         2
                68.80          1.15        1.3645    1   3   8         2
                68.83          2.18        1.3640    1  -6   7         2
                68.99          1.57        1.3612   -3   2  10         2
                69.15          1.27        1.3585   -4   0   9         2
                69.15          1.51        1.3585   -4   1   9         2
                69.51          1.36        1.3523    3   1   8         2
                70.17          2.74        1.3413   -2  -2  12         2
                70.23          1.74        1.3402    4  -1   8         2
                70.26          1.33        1.3397   -1   4   8         2
                70.28          1.91        1.3395    5  -2   5         2
                70.35          1.28        1.3383   -4  -2   7         2
                70.36          1.16        1.3381   -2   2  11         2
                70.60          3.86        1.3342    1  -4  12         2
                70.67          1.09        1.3329   -3  -4   3         2
                71.06          2.11        1.3267    1  -6   8         2
                71.38          1.73        1.3215   -2   5   6         2
                71.55          2.30        1.3187   -1   6   2         2
                71.56          1.38        1.3186   -2   3  10         2
                71.83          1.01        1.3142   -3  -4   1         2
                71.89          1.44        1.3133   -3   6   2         2
                71.96          1.21        1.3121    5  -4   5         2
                72.10          1.22        1.3100    1  -5  11         2
                72.15          1.43        1.3092    4  -6   2         2
                72.65          1.99        1.3014   -2  -5   1         2
                72.68          1.14        1.3009   -3  -4   6         2
                72.76          1.15        1.2998   -5  -1   1         2
                72.83          2.34        1.2986   -2  -5   6         2
                72.87          1.22        1.2981   -2   6   3         2
                73.62          1.74        1.2867    2  -5  11         2
                74.05          1.77        1.2802    0   3  10         2
                74.18          2.46        1.2783    3  -1  11         2
                75.10          1.91        1.2650   -1  -6   4         2
                75.70          1.98        1.2564   -2   5   7         2
                75.88          1.03        1.2539    2  -2  13         2
                76.33          2.28        1.2476    0   5   6         2
                77.11          1.20        1.2369    5  -4   7         2
                77.30          1.03        1.2343    3  -2  12         2
                78.67          1.26        1.2162    3  -4  12         2
                78.94          1.35        1.2128    6  -3   2         2
                79.02          1.28        1.2118    3   3   6         2
                79.31          1.07        1.2080   -2   7   0         2
                79.82          1.50        1.2016    3   1  10         2
                79.93          1.32        1.2002   -6   3   3         2
                80.56          2.22        1.1924    6  -1   1         2
                80.67          1.13        1.1911    3  -6  10         2
                81.23          2.15        1.1843   -6   1   4         2
                81.28          1.73        1.1836    2   5   3         2
                81.42          1.20        1.1820    5   1   4         2
                81.47          2.61        1.1814    1   1  13         2
                81.89          1.26        1.1764   -1  -6   9         2
                82.18          2.08        1.1730   -4   5   7         2
                82.33          1.19        1.1711    0  -2  15         2
                82.41          1.72        1.1703    2   3   9         2
                82.59          1.91        1.1682   -1   1  14         2
                83.29          1.46        1.1601   -1  -1  15         2
                84.47          1.43        1.1469   -1  -4  14         2
                84.59          1.00        1.1456    2   5   4         2
                88.22          1.02        1.1076   -4   0  13         2
                88.29          1.05        1.1069   -3   1  14         2
                88.44          1.08        1.1054    3   2  10         2
                88.44          1.02        1.1054    2  -3  15         2
                89.12          1.02        1.0987    5   0   8         2
                89.92          1.47        1.0910   -5  -3   1         2
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.