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
13.668 5.6601 11.743 90 113.64 90 P2_1/a
atom      x      y     z occ Biso
LaA   .2378  .0061 .2664  .7 1.06
CaA   .2378  .0061 .2664  .3 1.06
LaB   .0499  .0160 .7455     1.26
FeM1      0     .5    .5  .5  .81
MnM1      0     .5    .5  .5  .81
TiM2 -.0019  .2405 .0043      .86
TiM3  .2731 -.0150 .0025 .25  .56
FeM3  .2731 -.0150 .0025 .25  .56
AlM3  .2731 -.0150 .0025 .25  .56
NbM3  .2731 -.0150 .0025 .25  .56
Si1   .4117  .0054 .7347      .69
Si2   .1636 -.0168 .5476      .48
O1    .0757 -.2620 .1836       .8
O2    .0714  .2555 .1843      1.3
O3    .2889  .2529 .1248      1.2
O4    .2887 -.2497 .1224       .7
O5    .3776 -.2602 .4074      1.3
O6    .3865  .2806 .4053      1.6
O7    .0940 -.0053 .9882      1.1
O8    .4090  .0164 .0095       .7
O9    .4959  .0257 .6727      1.5
O10   .2907 -.0266 .6331      1.7
O11   .1365 -.0127 .4024      1.0