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Granite is igneous rock that was formed billions of years ago when magma cooled deep beneath the earth’s crust. Nearly as durable as diamond, granite owes its density and hardness to its origins, solidified deep within the earth under extreme pressure.
The commercial definition of granite includes many stones that are not truly granite as defined by a geologist, but these stones perform like granite and have the same characteristics.
Marble is a metamorphic form of limestone. Marble formed when sediment and other materials forged together beneath the weight of heavy bodies of water.
After millions of years, these crystallized minerals resulted in the stones that today we refer to as marbles, travertines, and onyx.
A considerable amount of research has been published in peer-reviewed scientific literature and all of it comes to the same conclusion: the levels of radon coming off a granite counter-tops are not excessive and not showing any risk for the population in their homes.
For more information on this topic, please visit the Marble Institute of America’s page.