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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.
Igneous rocks are created from solidified magma (rock that has been melted inside the earth), sedimentary rocks are created when smaller bits of rock or sand are cemented together, and metamorphic rock are formed when other types of rocks are subjected to heat and pressure.ntrusive rocks harden slowly beneath the surface of the earth, and often form large mineral crystals within the rock. Granite is a good example of an intrusive rock. Porphyritic intrusive rocks have large crystals embedded in a matrix of smaller crystals.