#------------------------------------------------------------------------------
#$Date: 2014-07-11 17:35:18 +0300 (Fri, 11 Jul 2014) $
#$Revision: 120071 $
#$URL: file:///home/coder/svn-repositories/cod/cif/1/00/17/1001742.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_1001742
loop_
_publ_author_name
'Nguyen, N'
'Choisnet, J'
'Raveau, B'
_publ_section_title              'Silicates synthetiques a structure milarite'
_journal_coden_ASTM              JSSCBI
_journal_name_full               'Journal of Solid State Chemistry'
_journal_page_first              1
_journal_page_last               9
_journal_volume                  34
_journal_year                    1980
_chemical_compound_source        'rich - synthetic'
_chemical_formula_structural     'Na K Mg5 Si12 O30'
_chemical_formula_sum            'K Mg5 Na O30 Si12'
_chemical_name_mineral           Eifelite
_chemical_name_systematic
;
Sodium potassium pentamagnesium dodecasilicate
;
_symmetry_cell_setting           hexagonal
_symmetry_Int_Tables_number      192
_symmetry_space_group_name_H-M   'P 6/m c c'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            2
_cell_length_a                   10.152
_cell_length_b                   10.152
_cell_length_c                   14.28
_cell_volume                     1274.6
_refine_ls_R_factor_all          0.055
_cod_database_code               1001742
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
-y,x-y,z
y-x,-x,z
x,y,-z
-y,x-y,-z
y-x,-x,-z
y,x,1/2+z
x-y,-y,1/2+z
-x,y-x,1/2+z
y,x,1/2-z
x-y,-y,1/2-z
-x,y-x,1/2-z
-x,-y,-z
y,y-x,-z
x-y,x,-z
-x,-y,z
y,y-x,z
x-y,x,z
-y,-x,1/2-z
y-x,y,1/2-z
x,x-y,1/2-z
-y,-x,1/2+z
y-x,y,1/2+z
x,x-y,1/2+z
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_symmetry_multiplicity
_atom_site_Wyckoff_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_attached_hydrogens
_atom_site_calc_flag
Na1 Na1+ 4 d 0.3333 0.6667 0. 0.5 0 d
K1 K1+ 2 a 0. 0. 0.25 1. 0 d
Mg1 Mg2+ 4 c 0.3333 0.6667 0.25 1. 0 d
Mg2 Mg2+ 6 f 0.5 0. 0.25 1. 0 d
Si1 Si4+ 24 m 0.763 0.114 0.109 1. 0 d
O1 O2- 12 l 0.734 0.132 0. 1. 0 d
O2 O2- 24 m 0.945 0.221 0.133 1. 0 d
O3 O2- 24 m 0.662 0.157 0.172 1. 0 d
loop_
_atom_type_symbol
_atom_type_oxidation_number
Na1+ 1.000
K1+ 1.000
Mg2+ 2.000
Si4+ 4.000
O2- -2.000
_journal_paper_doi 10.1016/0022-4596(80)90395-3