Made procedural sandstone texture with bunch of editable inputs (described a little bit in the file).
File contains all 3 variations from preview images (last two were rendered with experimental displacement feature which setup is not included in this file).
I think this setup is good for sedimentary rocks in general.
Tu as fait un travaille magnifique, surtout dans l'organisation des nodes: claire et rationnelle! Chapeau. Gabriel
Thanks, I've been looking for a sandstone texture for cycles.