Types of Soapstone and Oil shale
Some rocks according to their use or texture are classified into different types. Know more about Soapstone Texture and Oil shale Texture. The types of Soapstone and Oil shale are .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. Soapstone and Oil shale 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. Soapstone and Oil shale were for creating petroglyphs.