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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.
An igneous rock is a rock that is made from heat, and the different types of igneous rocks are Obsidian, Granite, Basalt, Pumice and Gabbro. 1 person found this useful. Edit. Share to: 1  Identifying Plagioclase Feldspar Plagioclase feldspar is a common mineral found in the Earth's crust.ll rocks are made of minerals. Igneous rocks are formed from molten and magma eg. basalt and granite, Sedimentary rocks are mechanically or organically formed eg. sandstone, â¦ limestone and shale and Metamorphic rocks are formed from igneous or sedimentary rocks altered by heat or pressure eg. slate and graphite.