From South Africa, Crassula dubia is a succulent rosette shaped plant with slightly asymmetrical leaves that slowly spiral around the center. The plant reportedly grows to 18 inches tall and a foot around. The leaves have a grayish bloom that doesn't rub off. It's similar to Crassula falcata, the "Propeller Plant", but the leaves are much rounder. In the summer it should produce clusters of small, white, star shaped flowers.
     It seems to be another slow grower and the new leaves aren't anywhere near as large as it had when I bought it. Overall the plant is about six inches across. I think it's too small to flower.