#------------------------------------------------------------------------------
#$Date: 2009-11-18 16:56:34 +0200 (Wed, 18 Nov 2009) $
#$Revision: 858 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/9001999.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_9001999
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: Ga, Na.94Na1.07Mg.93Mg4.87Ga.13Si8O22F2
;
_journal_name_full               'American Mineralogist'
_journal_page_first              102
_journal_page_last               111
_journal_volume                  84
_journal_year                    1999
_chemical_formula_sum            'F2 Ga0.14 Mg5.8 Na2.02 O22 Si8'
_[local]_cod_chemical_formula_sum_orig 'Si8 Mg5.8 Ga.14 Na2.02 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                 102.84
_cell_angle_gamma                90
_cell_length_a                   9.666
_cell_length_b                   17.902
_cell_length_c                   5.272
_cell_volume                     889.459
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) 0.28440 0.08490 0.28360 1.00000 0.00557
Si(2) 0.29210 0.17070 0.78780 1.00000 0.00709
Mg(1) 0.00000 0.08890 0.50000 1.00000 0.00912
Ga(2) 0.00000 0.17980 0.00000 0.07000 0.00975
Mg(2) 0.00000 0.17980 0.00000 0.93000 0.00975
Mg(3) 0.00000 0.00000 0.00000 1.00000 0.00798
Mg(4) 0.00000 0.26430 0.50000 0.47000 0.02330
Na(4) 0.00000 0.26430 0.50000 0.53000 0.02330
NaA 0.00000 0.50000 0.00000 0.26000 0.03331
NaA(m) 0.04440 0.50000 0.10150 0.35000 0.03521
O1 0.11390 0.08500 0.21340 1.00000 0.00595
O2 0.12040 0.16950 0.72310 1.00000 0.01001
F3 0.10370 0.00000 0.70710 1.00000 0.00925
O4 0.36830 0.24850 0.78460 1.00000 0.01748
O5 0.35040 0.12840 0.06960 1.00000 0.01976
O6 0.34680 0.11870 0.57080 1.00000 0.02647
O7 0.34560 0.00000 0.28380 1.00000 0.01456