/usr/share/icons/crystalgrayleft/index.theme is in crystalcursors 1.1.1-13.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [Icon Theme]
Name = Crystal Grayscale left
Comment = A cursor theme inspired from Crystal icons by Mart - Grayscale left handed version
Inherits = crystalgray
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