Gummite is a yellow amorphous mixture of uranium minerals, oxides, silicates, and hydrates of uranium, derived from the alteration of uraninite. It is named for its luster.
The material has been known by various other names, mostly due to differences in sample origins, including: eliasite from Elias â the name of a mine at Jáchymov, coracite â a variety from Lake Superior, pittinite, pechuran, urangummit, and uranogummite.