Wulfenite, etc. Wulfenite, etc. Orange-yellow, yellow, ... Re-named in 1845 by Wilhelm Karl von Haidinger in honor of Franz Xavier von Wulfen [November 5, 1728 Belgrade, Serbia - March 16, 1805 Klagenfurt, Austria], botanist, mineralogist, alpinist and member of the Order of the Society of Jesus (Jesuit).