data_global
_chemical_name_mineral 'Ilvaite'
loop_
_publ_author_name
'Carrozzini B'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 6 
_journal_year 1994
_journal_page_first 465
_journal_page_last 479
_publ_section_title
;
 Crystal structure refinements of ilvaite: new relationships
 between chemical composition and crystallographic parameters
 Sample: Seriphos X-3.1
;
_database_code_amcsd 0006539
_chemical_formula_sum 'Ca Fe2.91 Mg.02 Al.05 Mn.02 Si2 O9 H'
_cell_length_a 13.013
_cell_length_b 8.802
_cell_length_c 5.857
_cell_angle_alpha 90
_cell_angle_beta 90.28
_cell_angle_gamma 90
_cell_volume 670.855
_exptl_crystal_density_diffrn      4.027
_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
Ca   0.81274   0.37021   0.75348   1.00000   0.00747
FeM(1,1)   0.89014   0.04958   0.00758   0.98000   0.00646
MgM(1,1)   0.89014   0.04958   0.00758   0.02000   0.00646
FeM(1,2)   0.88993   0.05222   0.49237   0.95000   0.00659
AlM(1,2)   0.88993   0.05222   0.49237   0.05000   0.00659
FeM2   0.94105   0.74026   0.24859   0.98000   0.00697
MnM2   0.94105   0.74026   0.24859   0.02000   0.00697
Si1   0.95956   0.36897   0.24916   1.00000   0.00481
Si2   0.67934   0.22717   0.25225   1.00000   0.00469
O1   0.00965   0.03024   0.73575   1.00000   0.00798
O(2,1)   0.93716   0.27253   0.01596   1.00000   0.00697
O(2,2)   0.93533   0.27308   0.48212   1.00000   0.00722
O3   0.77743   0.10920   0.25698   1.00000   0.00659
O(4,1)   0.67110   0.32749   0.01885   1.00000   0.00735
O(4,2)   0.67040   0.33146   0.48210   1.00000   0.00773
O5   0.58477   0.10074   0.25389   1.00000   0.00659
O6   0.60150   0.02631   0.75219   1.00000   0.00912
O7   0.79811   0.10891   0.74316   1.00000   0.00722
H   0.74290   0.07049   0.73277   1.00000   0.02736