/usr/share/raster3d/materials/silver.r3d is in raster3d 3.0-3-2+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # silver
8
8. 0.4 1.0 1.0 0.3 0.0 0 0 0 1
SOLID 0.45 0.45 0.5
|