On The other hand, When you are tumbling hard rocks, such as quartz or agate, you will need a finer grit size to accomplish success. Coarse. Coarse grit is used to remove rough edges from rocks. It is the largest type of grit and will likely be silicon carbide. Unlike https://aboutmacrocosmmaterial03580.scrappingwiki.com/863760/new_step_by_step_map_for_silicon_carbide_semiconductor_process