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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.
Basalt is an extrusive igneous rock used in constructing buildings and statues. Extrusive rocks are also referred as volcanic rocks because volcanoes are important in their formation. When magma cools and hardens below the Earth's surface, an intrusive igneous rock forms. Because the process of the formation of intrusive igneous rock occurs slowly, these rocks tend to have a grainy texture. Examples of intrusive igneous rock include granite and gabbro. Granite is an intrusive igneous rock used as for making gravestones, statues, and countertops because it is very durable. Gabbro is an intrusive igneous rock that often contains profitable amounts of gold, chromium, and silver.