#------------------------------------------------------------------------------
#$Date$
#$Revision$
#$URL$
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#
# 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_9010301
loop_
_publ_author_name
'Gatta, G. D.'
'Angel, R. J.'
_publ_section_title
;
 Elastic behavior and pressure-induced structural evolution of nepheline:
 Implications for the nature of the modulated superstructure
 Locality: intrusive aplite of Snipe River, Tambani, Nyasaland, Malawi
 Sample: P = .0001 GPa, in DAC
;
_journal_name_full               'American Mineralogist'
_journal_page_first              1446
_journal_page_last               1455
_journal_volume                  92
_journal_year                    2007
_chemical_formula_sum            'Al4 Ca0.03 K0.54 Na3.24 O16 Si4'
_chemical_name_mineral           Nepheline
_space_group_IT_number           173
_symmetry_space_group_name_Hall  'P 6c'
_symmetry_space_group_name_H-M   'P 63'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_length_a                   9.9910
_cell_length_b                   9.9910
_cell_length_c                   8.3702
_cell_volume                     723.576
_diffrn_ambient_pressure         100
_[local]_cod_data_source_file    04420.cif
_[local]_cod_data_source_block   global
_[local]_cod_chemical_formula_sum_orig 'K.54 Na3.24 Ca.03 Al4 Si4 O16'
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
x-y,x,1/2+z
-y,x-y,z
-x,-y,1/2+z
-x+y,-x,z
y,-x+y,1/2+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
K 0.00000 0.00000 0.00510 0.54000 0.03200
NaK 0.00000 0.00000 0.00510 0.24000 0.03200
CaK 0.00000 0.00000 0.00510 0.03000 0.03200
Na 0.55384 0.99711 0.50710 1.00000 0.02390
AlT1 0.66667 0.33333 0.70280 1.00000 0.00690
SiT2 0.66667 0.33333 0.31440 1.00000 0.01730
SiT3 0.90486 0.66596 0.82172 1.00000 0.01120
AlT4 0.90743 0.66818 0.19535 1.00000 0.01280
O1 0.65650 0.28570 0.50220 0.33333 0.02340
O2 0.97400 0.68440 0.00210 1.00000 0.02440
O3 0.82200 0.47430 0.23040 1.00000 0.03730
O4 0.83930 0.49050 0.75260 1.00000 0.01980
O5 0.77050 0.71300 0.82260 1.00000 0.01080
O6 0.77870 0.73690 0.20160 1.00000 0.02740