This map shows the basic aggregates found throughout the United States. Make sure the blade you want is specifically designed to cut the aggregate. Choosing the wrong blade will result in poor performance and uneconomical use.
Soft – soft limestone, sandstone, dolomite limestone, soft shell
Medium Soft – pit gravel, limestone, dolomite
Medium – medium hard river gravel, medium traprock, decomposed granite, medium crushed gravel
Medium Hard – granite, slate, traprock, basalt, quartzite
Hard – hard chert, quartz, flint rock, hard river rock