/usr/share/avogadro/crystals/zeolites/MEL.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 20.2700(0)
_cell_length_b 20.2700(0)
_cell_length_c 13.4590(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 -4 m 2'
_symmetry_Int_Tables_number 119
_symmetry_cell_setting tetragonal
loop_
_symmetry_equiv_pos_as_xyz
'+x,+y,+z'
'1/2+x,1/2+y,1/2+z'
'-y,+x,-z'
'1/2-y,1/2+x,1/2-z'
'-x,-y,+z'
'1/2-x,1/2-y,1/2+z'
'+y,-x,-z'
'1/2+y,1/2-x,1/2-z'
'-x,+y,+z'
'1/2-x,1/2+y,1/2+z'
'+y,+x,-z'
'1/2+y,1/2+x,1/2-z'
'+x,-y,+z'
'1/2+x,1/2-y,1/2+z'
'-y,-x,-z'
'1/2-y,1/2-x,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 0.0950 0.1220 0.0935
O2 O 0.0976 0.2516 0.0962
O3 O 0.0888 0.1856 0.2634
O4 O 0.1994 0.1840 0.1615
O5 O 0.1207 0.2002 0.4514
O6 O 0.0983 0.3044 0.3405
O7 O 0.0000 0.2267 0.3919
O8 O 0.3001 0.1219 0.0812
O9 O 0.3148 0.1852 0.2500
O10 O 0.2976 0.2517 0.0846
O11 O 0.2952 0.0000 0.0145
O12 O 0.3786 0.0847 0.9362
O13 O 0.0000 0.3818 0.3912
O14 O 0.0818 0.4182 0.2500
O15 O 0.0000 0.0876 0.9710
T1 Si 0.1203 0.1858 0.1536
T2 Si 0.0768 0.2292 0.3618
T3 Si 0.2779 0.1857 0.1439
T4 Si 0.3063 0.0760 0.9840
T5 Si 0.0756 0.3799 0.3544
T6 Si 0.0762 0.0762 0.0000
T7 Si 0.1930 0.1930 0.5000
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