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wulfenite
From The Collaborative International Dictionary of English v.0.48:
Wulfenite \Wul"fen*ite\, n. [So named after F. X. Wulfen, an Australian mineralogist.] (Min.) Native lead molybdate occurring in tetragonal crystals, usually tabular, and of a bright orange-yellow to red, gray, or brown color; -- also called yellow lead ore. [1913 Webster]
