A sandstone with at the very least twenty five percent feldspar is termed arkose. A sandstone manufactured from volcanic particles is referred to as tuff.​ ^ Bureau of Transportation Stats. "Practice Studies 2014" (PDF). Transportation NSW. Retrieved 15 July 2018. ^ a b c d e f g h i https://charlieovbhm.free-blogz.com/59431201/the-5-second-trick-for-natural-stone-building-and-landscape-materials-nsw-central-west