Obsidian and Rapakivi Granite Types and Facts

Types of Obsidian and Rapakivi Granite

Some rocks according to their use or texture are classified into different types. Know more about Obsidian Texture and Rapakivi Granite Texture. Types of Obsidian are Fireworks Obsidian, Mahogany, Sheen Obsidian, Snowflake obsidian and Velvet Peacock Obsidian whereas the types of Rapakivi Granite are Igneous Protolith Granite, Sedimentary Protolith Granite, Mantle Granite, Anorogenic Granite and Hybrid Granite.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. Obsidian was used to create pictographs whereas Rapakivi 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. Obsidian was used to create petroglyphs whereas Rapakivi Granite was not used to create petroglyphs.