“Radon is a colorless, odorless, radioactive gas abundant in soil, water and hard rocks because it forms as naturally occurring uranium decays. It’s also the second-leading cause of lung cancer in the U.S. (the leading cause among non-smokers). If you’ve got granite countertops, it’s not a bad idea to test for radon in your home on an annual or semi-annual basis. And if you’re installing new countertops in the near future, you might want to buy something with a little less uranium, such as tiles, concrete or even Icestone, a product made from recycled glass and concrete.”
The Icestone product is very nice looking. Due to its high recycled content and Cradle to Cradle Certification, IceStone materials can be used towards LEED points. IceStone durable surfaces are made from 100% recycled glass and concrete.
Here is a link to the full article.

Very interesting post you wrote. Glad I have stumbled upon it. Cheers!