Sandstone with a great deal of matrix known as badly sorted. If matrix quantities to in excess of ten % of your rock, it is named a wacke ("wacky"). A very well-sorted sandstone (minimal matrix) with small cement is named an arenite. Yet another way to have a look at http://naturalstonebuildingandla56654.blogrenanda.com/15028715/the-basic-principles-of-sandstone-nsw