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#$Date: 2009-11-18 16:56:34 +0200 (Wed, 18 Nov 2009) $
#$Revision: 858 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/9001994.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/
#
# All data on this site have been placed in the public domain by the
# contributors.
#
data_9001994
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: Sc, Na.92Na1.97Mg.03Mg3.95Sc1.05Si8O22F2
;
_journal_name_full               'American Mineralogist'
_journal_page_first              102
_journal_page_last               111
_journal_volume                  84
_journal_year                    1999
_chemical_formula_sum            'F2 Mg4 Na3.65 O22 Sc1.06 Si8'
_[local]_cod_chemical_formula_sum_orig 'Si8 Mg4 Sc1.06 Na3.65 O22 F2'
_chemical_name_mineral           Fluoro-eckermannite
_symmetry_space_group_name_H-M   'C 1 2/m 1'
_cell_angle_alpha                90
_cell_angle_beta                 103.64
_cell_angle_gamma                90
_cell_length_a                   9.820
_cell_length_b                   18.036
_cell_length_c                   5.290
_cell_volume                     910.506
loop_
_symmetry_equiv_pos_as_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) 0.28270 0.08450 0.29070 1.00000 0.00456
Si(2) 0.28830 0.16950 0.79530 1.00000 0.00545
Mg(1) 0.00000 0.08840 0.50000 1.00000 0.00646
Sc(2) 0.00000 0.18150 0.00000 0.53000 0.00608
Mg(2) 0.00000 0.18150 0.00000 0.47000 0.00608
Mg(3) 0.00000 0.00000 0.00000 1.00000 0.00646
Na(4) 0.00000 0.27600 0.50000 0.97000 0.02546
Mg(4) 0.00000 0.27600 0.50000 0.03000 0.02546
NaA 0.00000 0.50000 0.00000 0.27000 0.02546
NaA(m) 0.04070 0.50000 0.09370 0.52000 0.02951
NaA(2) 0.00000 0.47490 0.00000 0.20000 0.03888
O1 0.11410 0.08460 0.21600 1.00000 0.00595
O2 0.11940 0.16590 0.72650 1.00000 0.00621
F3 0.10120 0.00000 0.70970 1.00000 0.00747
O4 0.36000 0.24830 0.79680 1.00000 0.00988
O5 0.34900 0.12740 0.07830 1.00000 0.00925
O6 0.34450 0.11800 0.57890 1.00000 0.00912
O7 0.34270 0.00000 0.29070 1.00000 0.00899