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Rocks resulting from cooled-off lava include obsidian, lava rock, basalt or pumice. These are known as extrusive igneous rocks because they are formed outside of the crust. There are about 700 different types of igneous rock. More examples of igneous rocks include tuff, diorite and andesite.Here are some uses of igneous rocks: Granite is used for building and construction because of its strong properties. It is also used for head stones and kitchen counter tops.here are about 700 different types of igneous rock. More examples of igneous rocks include tuff, diorite and andesite. Here are some uses of igneous rocks: Granite is used for building and construction because of its strong properties. It is also used for head stones and kitchen counter tops.
None of these have pores usually. But when the magma erupts as in a volcanoe, and if the volcanoe also contains lots of gass then you get very porous igneous rocks, such as vascular basalt, right through to pumice, whick is a glassy sponge, so light it floats on water.ll down to the formation of the rock types. Igneous are created by the cooling of magma, either within the earth itself (Intrusive) or as it erupts out of the ground (Extrusive). This cools to form vaious hard rocks such as Granite.