Recognize a common noun when you see one. Nouns name people, places, and things. Every noun can further be classified as common or proper. A common noun names general items. Go into the kitchen.
A sandstone with at least 25 percent feldspar is called arkose. A sandstone made of volcanic particles is called tuff. The cement in sandstone is usually one of three materials: silica (chemically the same as quartz), calcium carbonate or iron oxide.
The most common wacke is greywacke, but we can also describe the mineral content in a wacke by naming it a quartz wacke, arkosic wacke, or lithic wacke, meaning it mostly contains rock fragments. Lesson Summary. Sandstone is a type of sedimentary rock. They are made up primarily of sand-sized grains of either rock fragments or individual minerals.