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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.
Types of Rocks. There are three main types of rocks - igneous, sedimentary, and metamorphic. Igneous rocks are formed when melted rock (magma) cools and solidifies. Some igneous rocks are formed when the magma erupts from a volcano. Obsidian, basalt, and granite are all examples of igneous rocks.