Wulfenite (Yellow lead ore), named after F. X. Wulfen, an Australian mineralogist, is native lead molybdate occurring in tetragonal crystals, usually tabular, and of a bright orange-yellow to red, grey, or brown colour. It has the formulae PbMoO4 and a relative hardness of 3. It is a minor source of molybdenum and is found in the oxidized portion of lead veins with other secondary lead minerals.
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