data_global
_chemical_name_mineral 'Perrierite-(La)'
loop_
_publ_author_name
'Chukanov N V'
'Blass G'
'Pekov I V'
'Belakovskiy D I'
'Van K V'
'Rastsvetaeva R K'
'Aksenov S M'
_journal_name_full 'Zapiski Rossiiskogo Mineralogicheskogo Obshchetstva'
_journal_volume 140 
_journal_year 2011
_journal_page_first 34
_journal_page_last 44
_publ_section_title
;
 Perrierite-(La) (La,Ce,Ca)4Fe2+(Ti,Fe)4(Si2O7)2O8 - a new mineral
 species from volcanic region Eifel, Germany
;
_database_code_amcsd 0019036
_chemical_compound_source 'Dellen pumice quarry, Eifel Mountains, Rhineland-Palatinate, Germany'
_chemical_formula_sum 'La3.4 Ca.6 Fe Mn.5 Ti2.5 Al.5 Nb.5 Si4 O22'
_cell_length_a 13.668
_cell_length_b 5.6601
_cell_length_c 11.743
_cell_angle_alpha 90
_cell_angle_beta 113.64
_cell_angle_gamma 90
_cell_volume 832.229
_exptl_crystal_density_diffrn      4.883
_symmetry_space_group_name_H-M 'P 1 21/a 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2-y,z'
  '1/2-x,1/2+y,-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
LaA   0.23780   0.00610   0.26640   0.70000   0.01343
CaA   0.23780   0.00610   0.26640   0.30000   0.01343
LaB   0.04990   0.01600   0.74550   1.00000   0.01596
FeM1   0.00000   0.50000   0.50000   0.50000   0.01026
MnM1   0.00000   0.50000   0.50000   0.50000   0.01026
TiM2  -0.00190   0.24050   0.00430   1.00000   0.01089
TiM3   0.27310  -0.01500   0.00250   0.25000   0.00709
FeM3   0.27310  -0.01500   0.00250   0.25000   0.00709
AlM3   0.27310  -0.01500   0.00250   0.25000   0.00709
NbM3   0.27310  -0.01500   0.00250   0.25000   0.00709
Si1   0.41170   0.00540   0.73470   1.00000   0.00874
Si2   0.16360  -0.01680   0.54760   1.00000   0.00608
O1   0.07570  -0.26200   0.18360   1.00000   0.01013
O2   0.07140   0.25550   0.18430   1.00000   0.01646
O3   0.28890   0.25290   0.12480   1.00000   0.01520
O4   0.28870  -0.24970   0.12240   1.00000   0.00887
O5   0.37760  -0.26020   0.40740   1.00000   0.01646
O6   0.38650   0.28060   0.40530   1.00000   0.02026
O7   0.09400  -0.00530   0.98820   1.00000   0.01393
O8   0.40900   0.01640   0.00950   1.00000   0.00887
O9   0.49590   0.02570   0.67270   1.00000   0.01900
O10   0.29070  -0.02660   0.63310   1.00000   0.02153
O11   0.13650  -0.01270   0.40240   1.00000   0.01267