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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 = fire rocks. igneous rock (made from hot, melted rock) Igneous rocks form when melted rock, or magma cools and hardens. Sometimes the igneous rocks form in the ground (intrusive igneous rocks), and sometimes they form outside of the ground (extrusive igneous rocks).