#------------------------------------------------------------------------------
#$Date: 2024-04-18 18:56:43 +0300 (Thu, 18 Apr 2024) $
#$Revision: 291269 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/00/19/9001993.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/. The original data for this entry
# were provided the American Mineralogist Crystal Structure Database,
# http://rruff.geo.arizona.edu/AMS/amcsd.php
#
# The file may be used within the scientific community so long as
# proper attribution is given to the journal article from which the
# data were obtained.
#
data_9001993
loop_
_publ_author_name
'Oberti, R.'
'Hawthorne, F. C.'
'Camara, F.'
'Raudsepp, M.'
_publ_section_title
;
 Unusual M3+ cations in synthetic amphiboles with nominal fluoro-eckermannite
 composition: Deviations from stoichiometry and structural effects of the
 cummingtonite component
 Sample: Al, Na.98Na1.10Mg.90Mg4.88Al.12Si8O22F2
;
_journal_name_full               'American Mineralogist'
_journal_page_first              102
_journal_page_last               111
_journal_volume                  84
_journal_year                    1999
_chemical_formula_sum            'Al0.12 F2 Mg5.76 Na2.11 O22 Si8'
_chemical_name_mineral           Fluoro-eckermannite
_space_group_IT_number           12
_symmetry_space_group_name_Hall  '-C 2y'
_symmetry_space_group_name_H-M   'C 1 2/m 1'
_cell_angle_alpha                90
_cell_angle_beta                 102.82
_cell_angle_gamma                90
_cell_length_a                   9.668
_cell_length_b                   17.916
_cell_length_c                   5.271
_cell_formula_units_Z            2
_cell_volume                     890.241
_database_code_amcsd             0002055
_exptl_crystal_density_diffrn    3.008
_cod_original_formula_sum        'Si8 Mg5.76 Al.12 Na2.11 O22 F2'
_cod_database_code               9001993
loop_
_space_group_symop_operation_xyz
x,y,z
1/2+x,1/2+y,z
x,-y,z
1/2+x,1/2-y,z
-x,y,-z
1/2-x,1/2+y,-z
-x,-y,-z
1/2-x,1/2-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
Si(1) 0.28420 0.08480 0.28300 1.00000 0.00722
Si(2) 0.29220 0.17060 0.78720 1.00000 0.00849
Mg(1) 0.00000 0.08870 0.50000 1.00000 0.00874
Mg(2) 0.00000 0.17930 0.00000 0.94000 0.01127
Al(2) 0.00000 0.17930 0.00000 0.06000 0.01127
Mg(3) 0.00000 0.00000 0.00000 1.00000 0.00836
Na(4) 0.00000 0.26380 0.50000 0.56000 0.02318
Mg(4) 0.00000 0.26380 0.50000 0.44000 0.02318
NaA 0.00000 0.50000 0.00000 0.29000 0.03939
NaA(m) 0.04640 0.50000 0.11220 0.35000 0.03382
O1 0.11430 0.08470 0.21400 1.00000 0.00988
O2 0.12080 0.16980 0.72160 1.00000 0.01089
F3 0.10450 0.00000 0.70740 1.00000 0.01001
O4 0.36830 0.24880 0.78360 1.00000 0.01976
O5 0.35050 0.12770 0.06740 1.00000 0.02280
O6 0.34730 0.11940 0.56810 1.00000 0.02786
O7 0.34540 0.00000 0.28370 1.00000 0.01507
loop_
_cod_related_entry_id
_cod_related_entry_database
_cod_related_entry_code
1 AMCSD 0002055
