/usr/share/themes/Silicon/index.theme is in silicon-theme 0.1-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Type=X-GNOME-Metatheme
Name=Silicon
Comment=A clean theme to be easy on the eyes
Encoding=UTF-8
[X-GNOME-Metatheme]
GtkTheme=Silicon
MetacityTheme=Silicon
IconTheme=Tango
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