I often hear homeowners talk about the possibility of granite tops giving off radon. Here is a great article from This Old House to answer this question.

Grand River Granite
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Granite tile makes a stunning floor, wall
covering or granite tile countertop. Installing granite tile on
vertical surfaces takes some consideration – it is heavy. When using
granite as a tile flooring, be sure to have proper subflooring to
support the weight. Click Here for link to Ask The Builder article.