There’s a unique rock called Cumberlandite. And it’s called this because it’s so rare that the only place in the world where it can only be found in its natural state is on a 4-acre lot in Cumberland, Rhode Island. For this reason, it’s Rhode Island’s state rock. To Find It: Head to Elder Ballou Cemetery, located on Elder Ballou Meeting House Road in Cumberland, RI. When you see the cemetery, park across the street. The cumberlandite can be found behind the cemetery, and if you walk to the back of the cemetery you’ll see a path in the woods. Follow it to a rock covered clearing, and look down!