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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.
Some extrusive igneous rocks cool so quickly that they have a glassy texture. Common extrusive igneous rocks are: andesite, basalt, dacite, pumice, rhyolite, and obsidian. The crystals are so fine in obsidian, that paleo-people and modern surgeons alike use/used the rock to manufacture razor-sharp tools.