/usr/share/avogadro/crystals/zeolites/MRE.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 8.2570(0)
_cell_length_b 14.5620(0)
_cell_length_c 20.3140(0)
_cell_angle_alpha 90.0000(0)
_cell_angle_beta 90.0000(0)
_cell_angle_gamma 90.0000(0)
_symmetry_space_group_name_H-M 'I m m a'
_symmetry_Int_Tables_number 74
_symmetry_cell_setting orthorhombic
loop_
_symmetry_equiv_pos_as_xyz
'+x,+y,+z'
'1/2+x,1/2+y,1/2+z'
'-x,1/2-y,+z'
'1/2-x,-y,1/2+z'
'-x,1/2+y,-z'
'1/2-x,+y,1/2-z'
'+x,-y,-z'
'1/2+x,1/2-y,1/2-z'
'-x,-y,-z'
'1/2-x,1/2-y,1/2-z'
'+x,1/2+y,-z'
'1/2+x,+y,1/2-z'
'+x,1/2-y,+z'
'1/2+x,-y,1/2+z'
'-x,+y,+z'
'1/2-x,1/2+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 0.5000 0.7500 0.0119
O2 O 0.0000 0.7500 0.1502
O3 O 0.5000 0.9674 0.1698
O4 O 0.0000 0.9133 0.9539
O5 O 0.1942 0.7500 0.0476
O6 O 0.2765 0.8400 0.1546
O7 O 0.2500 0.9615 0.2500
O8 O 0.2102 0.0126 0.1279
O9 O 0.2543 0.0000 0.0000
O10 O 0.2875 0.8402 0.9414
T1 Si 0.3098 0.9448 0.1756
T2 Si 0.1884 0.9355 0.9414
T3 Si 0.3159 0.7500 0.9857
T4 Si 0.1863 0.7500 0.1268
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