Some rocks according to their use or texture are classified into different types. Know more about Siltstone Texture and Syenite Texture. Types of Siltstone are Not Available whereas the types of Syenite are Shonkinite.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. Siltstone was not used to create pictographs whereas Syenite 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. Siltstone was not used to create petroglyphs whereas Syenite was used to create petroglyphs.