Well, sure, granite is from the ground, but who knew your granite countertops could emit radon?  All granite emits some radon, the naturally occurring radioactive gas that is the second leading cause of lung cancer after cigarettes.  Red, pink, and purple granite slabs are apparently the biggest offenders, but most have a trace of radon well below the 4 pcq level that would have an effect.  To check on the cheap, put out one of the $15 home testers on your counter (windows closed) the next time you go out for the day.