/usr/share/avogadro/crystals/zeolites/MAR.cif is in avogadro-data 1.2.0-3.
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The actual contents of the file can be viewed below.
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#**************************************************************************
#
# CIF taken from the IZA-SC Database of Zeolite Structures
# Ch. Baerlocher and L.B. McCusker
# Database of Zeolite Structures: http://www.iza-structure.org/databases/
#
# All data on this site have been placed in the public domain.
# If you use this work in a scientific publication, you are obligated to
# cite its origin.
#
# The atom coordinates and the cell parameters were optimized with DLS76
# assuming a pure SiO2 composition.
#
#**************************************************************************
_cell_length_a 12.3920(0)
_cell_length_b 12.3920(0)
_cell_length_c 30.4690(0)
_cell_angle_alpha 90.0000(0)
_cell_angle_beta 90.0000(0)
_cell_angle_gamma 120.0000(0)
_symmetry_space_group_name_H-M 'P 63/m m c'
_symmetry_Int_Tables_number 194
_symmetry_cell_setting hexagonal
loop_
_symmetry_equiv_pos_as_xyz
'+x,+y,+z'
'-y,+x-y,+z'
'-x+y,-x,+z'
'-x,-y,1/2+z'
'+y,-x+y,1/2+z'
'+x-y,+x,1/2+z'
'-y,-x,+z'
'-x+y,+y,+z'
'+x,+x-y,+z'
'+y,+x,1/2+z'
'+x-y,-y,1/2+z'
'-x,-x+y,1/2+z'
'-x,-y,-z'
'+y,-x+y,-z'
'+x-y,+x,-z'
'+x,+y,1/2-z'
'-y,+x-y,1/2-z'
'-x+y,-x,1/2-z'
'+y,+x,-z'
'+x-y,-y,-z'
'-x,-x+y,-z'
'-y,-x,1/2-z'
'-x+y,+y,1/2-z'
'+x,+x-y,1/2-z'
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
O1 O 0.1163 0.8837 0.0136
O2 O 0.0245 0.6526 0.1227
O3 O 0.8832 0.4416 0.0809
O4 O 0.7929 0.5859 0.1030
O5 O 0.4525 0.5475 0.1827
O6 O 0.5813 0.7906 0.1765
O7 O 0.6870 0.6679 0.2067
O8 O 0.4695 0.9390 0.7500
O9 O 0.5387 0.7693 0.7500
O10 O 0.9613 0.6559 0.0408
T1 Si 0.9156 0.5837 0.0869
T2 Si 0.5876 0.6647 0.1718
T3 Si 0.9163 0.5864 0.2500
T4 Si 0.2494 0.0000 0.0000
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