Descloisite Berg Aukus
Berg Aukas Mine, Grootfontein, Otavi Mountain Land, Namibia
This is an excellent, old specimen from this classic locality. There are no contact points or matrix; the underside is all microcrystalline. The crystals start as a root beer going to a deep red, and the tops become a burnt black. I purchased this in Namibia from A.W. Jooste who collected it as a mine surveyor decades ago.