Wulfenite is fairly rare but is known from Namibia and Congo. The mineral was named after the Austrian mineralogist, Frantz Xaver von Wulfen (1728-1805). Wulfenite is a secondary lead mineral which ranges from yellow to orange in colour. Wulfenite is recognised as being fluorescent and under short to long UV is generally yellow to orange to red. A very rare and very beautiful mineral species for the collectors.