#------------------------------------------------------------------------------
#$Date: 2009-11-18 16:56:34 +0200 (Wed, 18 Nov 2009) $
#$Revision: 858 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/9001220.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_9001220
loop_
_publ_author_name
'Angel R J'
'Gasparik T'
'Finger L W'
_publ_section_title
;
 Crystal structure of a Cr-bearing pyroxene
 Sample: Mg1.4Cr.6Si2O6
;
_journal_name_full               'American Mineralogist'
_journal_page_first              599
_journal_page_last               603
_journal_volume                  74
_journal_year                    1989
_chemical_formula_sum            'Cr0.306 Mg0.712 O3 Si0.982'
_[local]_cod_chemical_formula_sum_orig 'Mg.712 Cr.306 Si.982 O3'
_chemical_name_mineral           Enstatite
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_cell_angle_alpha                90
_cell_angle_beta                 109.41
_cell_angle_gamma                90
_cell_length_a                   9.713
_cell_length_b                   8.910
_cell_length_c                   5.238
_cell_volume                     427.547
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
x,1/2-y,1/2+z
-x,1/2+y,1/2-z
-x,-y,-z
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
Mg1 0.25060 0.65370 0.22530 0.94600
Cr1 0.25060 0.65370 0.22530 0.05400
Mg2 0.25280 0.01620 0.22090 0.47900
Cr2 0.25280 0.01620 0.22090 0.52100
SiA 0.04560 0.33870 0.28910 0.98300
CrA 0.04560 0.33870 0.28910 0.01700
SiB 0.54930 0.83810 0.24370 0.98100
CrB 0.54930 0.83810 0.24370 0.01900
O1A 0.86940 0.33470 0.17480 1.00000
O2A 0.12260 0.49840 0.32690 1.00000
O3A 0.10920 0.27530 0.60550 1.00000
O1B 0.37260 0.83990 0.13360 1.00000
O2B 0.63210 0.98710 0.38200 1.00000
O3B 0.60210 0.70660 0.48340 1.00000
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Mg1 0.00808 0.00845 0.00420 0.00041 0.00092 0.00178
Cr1 0.00808 0.00845 0.00420 0.00041 0.00092 0.00178
Mg2 0.00808 0.00764 0.00544 0.00207 0.00069 0.00045
Cr2 0.00808 0.00764 0.00544 0.00207 0.00069 0.00045
SiA 0.00850 0.00804 0.00495 -0.00124 0.00252 0.00022
CrA 0.00850 0.00804 0.00495 -0.00124 0.00252 0.00022
SiB 0.00510 0.00684 0.00532 0.00083 0.00046 0.00045
CrB 0.00510 0.00684 0.00532 0.00083 0.00046 0.00045
O1A 0.00850 0.01207 0.00618 0.00331 0.00092 0.00223
O2A 0.01020 0.00442 0.00742 -0.00289 0.00367 -0.00223
O3A 0.00893 0.00804 0.00247 -0.00289 -0.00046 0.00268
O1B 0.00383 0.00925 0.00371 -0.00248 0.00000 0.00000
O2B 0.01446 0.00684 0.00989 -0.00414 0.00780 -0.00223
O3B 0.00553 0.01005 0.00371 0.00000 -0.00344 0.00290