Wulpenite

Wulpenite is a rare mineral composed of lead molybdate, with the chemical formula PbMoO4. It belongs to the scheelite group, characterized by its tetragonal crystal system. Wulpenite typically occurs as small, transparent to translucent crystals, often exhibiting a bright yellow to orange-red color. It can also be found in earthy or massive forms. The mineral is relatively soft, with a Mohs hardness of 2.5 to 3, and has a high specific gravity due to the presence of lead.

Wulpenite is found in oxidized lead-zinc deposits, often associated with other lead minerals such as cerussite and anglesite, as well as secondary molybdenum minerals like wulfenite. It forms through the weathering and alteration of primary sulfide minerals in the upper zones of ore bodies. Notable occurrences include the Ojuela Mine in Mapimí, Durango, Mexico, where exceptionally fine specimens have been recovered, as well as locations in Austria, France, and the United States.

The mineral was first described in 1845 and named in honor of the Belgian mineral collector Ferdinand Wulpen. Wulpenite is primarily of interest to mineral collectors and geologists. While not a significant ore of lead or molybdenum, its attractive crystalline forms and vibrant colors make it a sought-after specimen mineral.

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