Some rocks according to their use or texture are classified into different types. Know more about Rapakivi Granite Texture and Hornfels Texture. Types of Rapakivi Granite are Igneous Protolith Granite, Sedimentary Protolith Granite, Mantle Granite, Anorogenic Granite and Hybrid Granite whereas the types of Hornfels are Biotite hornfels.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. Rapakivi Granite was not used to create pictographs whereas Hornfels 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. Rapakivi Granite was not used to create petroglyphs whereas Hornfels was used to create petroglyphs.