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