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#$Date: 2016-02-16 14:49:47 +0200 (Tue, 16 Feb 2016) $
#$Revision: 176465 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/01/63/9016379.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_9016379
loop_
_publ_author_name
'Mills, S. J.'
'Whitfield, P. S.'
'Wilson, S. A.'
'Woodhouse, J. N.'
'Dipple, G. M.'
'Raudsepp, M.'
'Francis, C. A.'
_publ_section_title
;
 The crystal structure of stichtite, re-examination of barbertonite, and the
 nature of polytypism in MgCr hydrotalcites
 Note: Sample 84588, 2H1 polytype of stichtite = barbertonite
;
_journal_name_full               'American Mineralogist'
_journal_page_first              179
_journal_page_last               187
_journal_paper_doi               10.2138/am.2011.3531
_journal_volume                  96
_journal_year                    2011
_chemical_compound_source        'Barberton, South Africa'
_chemical_formula_sum            'C0.124 H3.224 Cr0.25 Mg0.75 O2.984'
_chemical_name_mineral           Stichtite
_space_group_IT_number           194
_symmetry_space_group_name_Hall  '-P 6c 2c'
_symmetry_space_group_name_H-M   'P 63/m m c'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_length_a                   3.09689
_cell_length_b                   3.09689
_cell_length_c                   15.6193
_cell_volume                     129.731
_database_code_amcsd             0018331
_exptl_crystal_density_diffrn    2.143
_cod_original_formula_sum        '(Mg.75 Cr.25) O2.984 H3.224 C.124'
_cod_database_code               9016379
loop_
_space_group_symop_operation_xyz
x,y,z
-x,-x+y,1/2+z
x,x-y,1/2-z
-x+y,-x,1/2-z
x-y,x,1/2+z
-y,-x,z
y,x,-z
y,-x+y,-z
-y,x-y,z
x-y,-y,1/2+z
-x+y,y,1/2-z
x,y,1/2-z
-x,-y,1/2+z
x,x-y,z
-x,-x+y,-z
x-y,x,-z
-x+y,-x,z
y,x,1/2+z
-y,-x,1/2-z
-y,x-y,1/2-z
y,-x+y,1/2+z
-x+y,y,z
x-y,-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
Mg 0.00000 0.00000 0.00000 0.75000 0.01013
Cr 0.00000 0.00000 0.00000 0.25000 0.01013
O1 0.33333 0.66667 0.06500 1.00000 0.00811
H1 0.33333 0.66667 0.13100 1.00000 0.00811
Wat2 0.23000 -0.23000 0.25000 0.20400 0.00811
CO3 0.33333 0.66667 0.25000 0.12400 0.00811
O3 0.33333 0.66667 0.25000 0.37200 0.00811