Rocks Rocks are studied in three types in Physical Geology: Igneous Sedimentary Metamorphic Open an accordion to view photographs of the rock type. Types of Rocks Igneous Pumice Scoria Obsidian Granite Diorite Gabbro Peridotite Porphyritic Rhyolite Porphyritic Andesite Basalt Sedimentary Conglomerate Breccia Sandstone Arkose Shale Coquina Fossiliferous Limestone (limestone in center) Travertine Caliche Chert Rock Salt Rock Gypsum Metamorphic Slate Phyllite Schist Gneiss Marble Quartzite
