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#$Date: 2024-04-25 17:59:02 +0300 (Thu, 25 Apr 2024) $
#$Revision: 291351 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/00/29/9002912.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_9002912
loop_
_publ_author_name
'Thompson, R. M.'
'Downs, R. T.'
_publ_section_title
;Model pyroxenes I: Ideal pyroxene topologies Pyroxene #5 based on stacking
 sequence ABABABAC Note: Atoms Mg, Si, and O are assigned to atomic positions
 just for convenience.
;
_journal_name_full               'American Mineralogist'
_journal_page_first              653
_journal_page_last               666
_journal_paper_doi               10.2138/am-2003-0419
_journal_volume                  88
_journal_year                    2003
_chemical_formula_structural     Mg2(Si2O6)
_chemical_formula_sum            'Mg O3 Si'
_chemical_name_mineral           Pyroxene-ideal
_space_group_IT_number           7
_symmetry_space_group_name_Hall  'P -2yc'
_symmetry_space_group_name_H-M   'P 1 c 1'
_cell_angle_alpha                90
_cell_angle_beta                 90.
_cell_angle_gamma                90
_cell_length_a                   13.0639452948
_cell_length_b                   6
_cell_length_c                   3.46410161514
_cell_formula_units_Z            16
_cell_volume                     271.529
_exptl_crystal_density_diffrn    9.823
_cod_original_formula_sum        'Si Mg O3'
_cod_database_code               9002912
_cod_struct_determination_method theoretical
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
x,-y,1/2+z
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
SiA 0.96875 0.91667 0.16667
SiB 0.90625 0.41667 0.00000
Mg1a 0.81250 0.08333 0.33333
Mg2a 0.81250 0.75000 0.33333
SiC 0.71875 0.58333 0.83333
SiD 0.65625 0.91667 0.50000
Mg1b 0.56250 0.58333 0.16667
Mg2b 0.56250 0.25000 0.16667
SiE 0.40625 0.58333 0.50000
SiF 0.46875 0.08333 0.33333
Mg1c 0.31250 0.08333 0.66667
Mg2c 0.31250 0.75000 0.66667
SiG 0.15625 0.08333 0.00000
SiH 0.21875 0.41667 0.33333
Mg1d 0.06250 0.41667 0.66667
Mg2d 0.06250 0.25000 0.16667
O1A 0.87500 0.91667 0.16667
O2A 0.00000 0.75000 0.00000
O3A 0.00000 0.08333 0.00000
O1B 0.00000 0.41667 0.00000
O2B 0.87500 0.58333 0.16667
O3B 0.87500 0.75000 0.66667
O1C 0.62500 0.41667 0.33333
O2C 0.75000 0.75000 0.00000
O3C 0.75000 0.41667 0.00000
O1D 0.75000 0.08333 0.00000
O2D 0.62500 0.75000 0.33333
O3D 0.62500 0.08333 0.33333
O1E 0.50000 0.41667 0.00000
O2E 0.37500 0.75000 0.33333
O3E 0.37500 0.41667 0.33333
O1F 0.37500 0.08333 0.33333
O2F 0.50000 0.75000 0.00000
O3F 0.50000 0.08333 0.00000
O1G 0.25000 0.08333 0.00000
O2G 0.12500 0.75000 0.33333
O3G 0.12500 0.08333 0.33333
O1H 0.12500 0.41667 0.33333
O2H 0.25000 0.25000 0.50000
O3H 0.25000 0.41667 0.00000
_database_code_amcsd 0003001
