Anthracite and Rhomb Porphyry Types and Facts

Types of Anthracite and Rhomb Porphyry

Some rocks according to their use or texture are classified into different types. Know more about Anthracite Texture and Rhomb Porphyry Texture. Types of Anthracite are Semi-anthracite and Meta-anthracite whereas the types of Rhomb Porphyry are Igneous rock.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. Anthracite and Rhomb Porphyry were 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. Anthracite and Rhomb Porphyry were for creating petroglyphs.