/usr/share/mandelbulber2/materials/metal.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 | # Mandelbulber settings file
# version 2.08
# only modified parameters
[main_parameters]
mat1_is_defined true;
mat1_name metal;
mat1_reflectance 0,87;
mat1_specular 10;
mat1_specular_width 0,199;
mat1_surface_color 6100 6100 6100;
mat1_use_colors_from_palette false;
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