Some rocks according to their use or texture are classified into different types. Know more about Ignimbrite Texture and Nepheline Syenite Texture. Types of Ignimbrite are Not Available whereas the types of Nepheline Syenite are Borolanite and Litchfieldite.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. Ignimbrite and Nepheline Syenite were used for creating 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. Ignimbrite and Nepheline Syenite were used for creating petroglyphs.