/usr/share/avogadro/crystals/halides/ is in avogadro-data 1.2.0-1+deb9u1.
This file is owned by root:root, with mode 0o755.
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/usr/share/avogadro/crystals/halides/AgBr-Bromargyrite.cif
/usr/share/avogadro/crystals/halides/AgCl-Chlorargyrite.cif
/usr/share/avogadro/crystals/halides/AlCl3.cif
/usr/share/avogadro/crystals/halides/AlNa3F6-Cryolite.cif
/usr/share/avogadro/crystals/halides/CaF2-Fluorite.cif
/usr/share/avogadro/crystals/halides/CdCl2.cif
/usr/share/avogadro/crystals/halides/CdI2.cif
/usr/share/avogadro/crystals/halides/CrCl2.cif
/usr/share/avogadro/crystals/halides/CrCl3.cif
/usr/share/avogadro/crystals/halides/CsCl.cif
/usr/share/avogadro/crystals/halides/FeCl3-Molysite.cif
/usr/share/avogadro/crystals/halides/HgCl-Calomel.cif
/usr/share/avogadro/crystals/halides/KBr.cif
/usr/share/avogadro/crystals/halides/KCl-Sylvite.cif
/usr/share/avogadro/crystals/halides/NaCl-Halite.cif
/usr/share/avogadro/crystals/halides/PbFCl-Matlockite.cif