This unusual specimen came to me in a collection of interesting South African minerals. I had never seen one offered for sale, and apparently the explanation is that the deposit is jealously guarded by both mining interests and the state, and exports are generally forbidden. The piece is a very rich specimen with grains of gold richly dispersed throughout a very strange matrix of lightweight, carbon-rich rock. I've not seen a gold matrix like this, ever, and I am honestly not sure what rock this is...though it at least is pretty.