Granite and basalt are excellent examples of coarsely grained igneous rocks. The coarseness of such igneous rocks is a result of magma becoming trapped beneath sediment and stone, which allows the liquid to cool at a slower rate.
Rocks that originate by this slow process are classified as phaneritic. These contrast with aphanitic igneous, which are made up of microscopic grains, and igneous rock that is cooled so quickly it takes on characteristics of glass. The conditions necessary to form phaneritic rock leave it buried beneath the Earth's crust. Over time, wind and water work to erode the mineral material containing this slow-cooled magma, until finally it is exposed to the surface.Learn More
The most common type of igneous rock, basalt, also known as malfic rock, can be found on oceanic plates at divergent plate boundaries. Intermediate and felsic igneous rocks show up along continental margins, as well. Because igneous rocks form from the cooling of lava and magma, they can be found around areas where volcanic activity is or has been present.Full Answer >
Granite and rhyolite are two of the most commonly found igneous rocks that possess a high silica content. They are formed through the cooling of magma above or below the Earth's surface.Full Answer >
Examples of igneous rocks include granite, pegmatite, diorite, gabbro, dunite and peridotite. Other examples of igneous rocks are kimberlite, rhyolite, quartz porphyry, dacite, latite, andesite, basalt, obsidian and pumice.Full Answer >
Some uses of igneous rock include serving as material for buildings and roads. Igneous rocks reduced to gravel size serve as ballast for railroad beds. Igneous rocks are also used for countertops, backsplashes and sinks. They can be carved into works of art and weapons.Full Answer >