#------------------------------------------------------------------------------
#$Date: 2012-02-28 17:44:07 +0200 (Tue, 28 Feb 2012) $
#$Revision: 35913 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/00/76/9007649.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_9007649
loop_
_publ_author_name
'Gunawardane, R. P.'
'Howie, R. A.'
'Glasser, F. P.'
_publ_section_title
;
 Structure of the oxyapatite NaY9(SiO4)6O2
 Note: apatite structure
;
_journal_name_full               'Acta Crystallographica, Section B'
_journal_page_first              1564
_journal_page_last               1566
_journal_volume                  38
_journal_year                    1982
_chemical_formula_sum            'Na0.5 O13 Si3 Y4.5'
_chemical_name_mineral           NaY9(SiO4)6O2
_space_group_IT_number           176
_symmetry_space_group_name_Hall  '-P 6c'
_symmetry_space_group_name_H-M   'P 63/m'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_length_a                   9.334
_cell_length_b                   9.334
_cell_length_c                   6.759
_cell_volume                     509.975
_exptl_crystal_density_diffrn    4.583
_[local]_cod_chemical_formula_sum_orig 'Na.5 Y4.5 Si3 O13'
_cod_database_code               9007649
_amcsd_database_code             AMCSD#0009577
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
-x+y,-x,1/2-z
x-y,x,1/2+z
y,-x+y,-z
-y,x-y,z
x,y,1/2-z
-x,-y,1/2+z
x-y,x,-z
-x+y,-x,z
-y,x-y,1/2-z
y,-x+y,1/2+z
-x,-y,-z
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
Na2 0.01126 0.01126 0.00440 0.00563 0.00000 0.00000
Y2 0.01126 0.01126 0.00440 0.00563 0.00000 0.00000
Y1 0.00993 0.01126 0.00509 0.00480 0.00000 0.00000
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
Na2 0.33333 0.66667 -0.00190 0.25000 0.00900
Y2 0.33333 0.66667 -0.00190 0.75000 0.00900
Y1 0.23750 0.00420 0.25000 1.00000 0.00894
Si 0.37230 0.39940 0.25000 1.00000 0.00329
O1 0.24860 0.33890 0.43800 1.00000 0.01507
O2 0.48680 0.31710 0.25000 1.00000 0.01241
O3 0.52520 0.40130 0.75000 1.00000 0.01051
O4 0.00000 0.00000 0.25000 1.00000 0.01520