Some rocks according to their use or texture are classified into different types. Know more about Greywacke Texture and Benmoreite Texture. Types of Greywacke are Not Available whereas the types of Benmoreite are Alkaline Basalt, Boninite, High Alumina Basalt, Mid Ocean Ridge Basalt (MORB) and Tholeiitic Basalt.During historic times, some rocks depending on their hardness were used to create Pictographs and Petroglyphs. Rocks which are hard were generally not used. Pictographs are paintings or drawings that have been placed or created on the surface of rock. Greywacke was not used to create pictographs whereas Benmoreite is used to create pictographs. Petroglyph is an image which is carved into a rock. These are images created by removing part of a rock surface by incising, picking, carving or abrading, as a form of rock art. Greywacke was not used to create petroglyphs whereas Benmoreite was used to create petroglyphs.