The document lists different types of igneous, sedimentary, and metamorphic rocks. Under igneous rocks it includes rhyolite, basalt, granite, gabbro, obsidian, diorite, tuff, pumice and ash. Sedimentary rocks listed are limestone, shale, sandstone, coal, halite, breccia and conglomerate. Metamorphic rocks mentioned are hornfels, gneiss, slate, marble, schist, quartzite and amphibolite.