A sandstone with at least 25 percent feldspar is named arkose. A sandstone made from volcanic particles is referred to as tuff.​ [4] The 1st was a timber booking and parcels Office environment elevated with a steel beam frame with a concrete deck that was located adjacent to Eskbank Road. http://sandstone-blocks-bathurst61479.frewwebs.com/16046958/the-ultimate-guide-to-sandstone-blocks-blue-mountains