/usr/share/gwyddion/glmaterials/Jade is in gwyddion-common 2.50-2.
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
0.135 0.2225 0.1575 1.0
0.54 0.89 0.63 1.0
0.316228 0.316228 0.316228 1.0
0.0 0.0 0.0 1.0
0.1
|