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How Is Granite Formed?


Important!

ANSWER:

Granite is formed by the solidification of magma under the earth’s surface.


More Info: To form granite, magma must first cool underground. This is an extremely slow process. Since the time required to form granite is rather long, it is both a strong and valuable stone. Granite is actually made up of several different minerals including feldspar and quartz. These and other minerals, such as mica, give it a grainy composition and course texture, which results in an earthy and natural look.

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The crystals that make up granite are interlocked, much like the pieces of a puzzle. This unique pattern of construction is what’s responsible for granite’s strength and durability. Granite is forced to endure high levels of heat and pressure during its time underground. This makes it very heat resistant and unlikely to crack or deteriorate.

Where Can Granite Be Found?

Granite can be found underground in almost every continent. Granite is extracted from the earth in large slabs, which are then polished and cut to size for commercial and home use. It typically comes in dark shades of green, brown, and black but can be found in many different colors including pink, gray, and white or often a combination of colors, depending on the mineral composition.

How Is Granite Used?

Granite has been used in place of marble in many modern constructions. It is often found as a countertop surface. Granite was also used in several ancient constructions such as some of the Egyptian pyramids as well as several temples in southern India.

Expert Opinion

 

Quote: “Granite rocks are igneous rocks which were formed by slowly cooling pockets of magma that were trapped beneath the earth’s surface. Granite is used for long lasting monuments and for trim and decoration on buildings.”

 

Source: Granite Rocks Rock Hounds with Rocky
The Franklin Institute

 

 

Resources

 

“Ask GEO Man.” University of Oregon Department of Physics. University of Oregon, n.d. Web. 21 May 2010. <jersey.uoregon.edu/~mstrick/AskGeoMan/geoQuerry27.html>.

“Granite – New World Encyclopedia.” Info:Main Page – New World Encyclopedia. N.p., n.d. Web. 21 May 2010. http://www.newworldencyclopedia.org/entry/Granite.

Kanen, Rob. “The Emplacement and Origin of Granite.” Geologynet – Geology and Earth Science. N.p., n.d. Web. 21 May 2010. http://www.geologynet.com/granite1.htm.


Fun Facts

 
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