Some rocks according to their use or texture are classified into different types. Know more about Icelandite Texture and Diatomite Texture. The types of Icelandite and Diatomite are Not Available.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. Icelandite was not used to create pictographs whereas Diatomite is 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. Icelandite was not used to create petroglyphs whereas Diatomite was used to create petroglyphs.