A real piece of uranium ore. Not shitting you. It's been tested with an actual geiger counter.
The activity rate (CPM - counts per minute is different for each sample and is printed on the label. Comes with an NRC certication. Includes all radiation types - alpha, beta and gamma.
We have no idea if that's a good thing or a bad thing. Is that too much radiation? Will it cause you to grow extra limbs or make your dog into a super mutant? We can only hope.
For extra fun, read the comments/reviews on the product page. Pure awesomeness... :)