/usr/share/mandelbulber2/materials/diamond.fract is in mandelbulber2-data 2.08.3-1build1.
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 7 8 9 10 11 12 13 14 | # Mandelbulber settings file
# version 2.08
# only modified parameters
[main_parameters]
mat1_fresnel_reflectance true;
mat1_is_defined true;
mat1_name diamond;
mat1_reflectance 1;
mat1_specular 20;
mat1_specular_width 0,108;
mat1_transparency_index_of_refraction 3,52;
mat1_transparency_interior_color c100 c100 c100;
mat1_transparency_of_surface 1;
mat1_use_colors_from_palette false;
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