Some rocks according to their use or texture are classified into different types. Know more about Porphyry Texture and Skarn Texture. Types of Porphyry are Rhomb Porphyry whereas the types of Skarn are Endoskarns.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. Porphyry and Skarn were not 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. Porphyry and Skarn were not used for creating petroglyphs.