/usr/share/gwyddion/glmaterials/Pearl is in gwyddion-common 2.47-1.
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
0.25 0.20725 0.20725 1.0
1.0 0.829 0.829 1.0
0.296648 0.296648 0.296648 1.0
0.0 0.0 0.0 1.0
0.088
|