Some rocks according to their use or texture are classified into different types. Know more about Conglomerate Texture and Blue Granite Texture. The types of Conglomerate and Blue Granite are Not Available.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 Blue Granite 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 Blue Granite was not used to create petroglyphs.