/usr/share/gwyddion/glmaterials/Bronze is in gwyddion-common 2.44-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | Gwyddion resource GwyGLMaterial
0.2125 0.1275 0.054 1.0
0.714 0.4284 0.18144 1.0
0.393548 0.271906 0.166721 1.0
0.0 0.0 0.0 1.0
0.2
|