Sandstone with a great deal of matrix is called inadequately sorted. If matrix quantities to greater than 10 per cent with the rock, it is named a wacke ("wacky"). A perfectly-sorted sandstone (little matrix) with minimal cement is called an arenite. Yet another way to look at it is wacke https://sandstone-blocks-and-logs18407.blogadvize.com/17588943/the-greatest-guide-to-natural-stone-building-and-landscape-materials-nsw-central-west