Types of Anthracite and Anorthosite
Some rocks according to their use or texture are classified into different types. Know more about Anthracite Texture and Anorthosite Texture. Types of Anthracite are Semi-anthracite and Meta-anthracite whereas the types of Anorthosite are Proterozoic Anorthosite and Archean Anorthosite.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 was used to create pictographs whereas Anorthosite 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. Anthracite was used to create petroglyphs whereas Anorthosite was not used to create petroglyphs.