/usr/share/gwyddion/glmaterials/Turquoise 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
0.1 0.18725 0.1745 1.0
0.396 0.74151 0.69102 1.0
0.297254 0.30829 0.306678 1.0
0.0 0.0 0.0 1.0
0.1
|