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.Continue Reading
Some igneous rocks, such as lamproite, contain gemstones such as diamonds and spinel. Pegmatite, a coarse-grained rock very much like granite, contains useful minerals and elements such as boron and lithium. Beryl and tourmaline can also be found in pegmatite.
Granite, a hard rock that's formed by magma that has slowly cooled in the Earth's crust, is sought after not only for its toughness but its beauty. It can come in colors of white, red, pale greens and blues, grays, blacks and violet. Because of this, it is prized for home decoration and is used for flooring, countertops and table tops.
Basalt is the most common igneous rock and forms much of the seabed. It's often black, but can be gray, brown, pale green or red. Ancient Egyptians used basalt as an ornamental stone.
Obsidian forms when thick, hot lava cools quickly, before the minerals have a chance to crystallize. This gives the rock a glassy texture. Prehistoric people used obsidian to make sharp points and blades.Learn more about Geology
Limestone's most common use is as a crushed construction material, serving as a base for roads and ballast in railroads, but it also combines with crushed shale in a kiln to make cement and serves as an aggregate material in concrete. Limestone's usefulness stems from its strength and density.Full Answer >
Granite is one of the strongest, most attractive rocks naturally produced, which makes it valuable to builders and homeowners for a number of interior and exterior applications. Granite is used in projects to provide elegance and quality.Full Answer >
Pumice is categorized as an extrusive igneous rock. Extrusive rock formations are made when molten lava flows from the interior of the Earth and solidifies on the surface.Full Answer >
Basalt is an igneous rock, which means it was formed deep in the bowels of the earth, often from the lava flow of a volcano. This makes it largely an extrusive rock.Full Answer >