Wulfenite with Mimetite

Wulfenite with Mimetite from Erupcion Mine, Los Lamentos, Chihuahua, Mexico, measuring 57 × 44 × 35 mm and weighing 119 grams. This is a lead-mineral association with a specific Mexican mine attribution. Its interest comes from considering the two species together, as part of a locality assemblage rather than simply a single display mineral.

Wulfenite is lead molybdate, while Mimetite is a lead arsenate containing chloride. The shared lead content links them chemically, but their different anions place them in separate mineral groups. That comparison offers a useful way to explore how a metal can be incorporated into several distinct secondary minerals within oxidised mineral-deposit environments.

Numerous small reflective faces give the olive-brown surface a lively appearance, with lighter yellow-green areas among them. The piece is best appreciated at close range, where separate groups emerge from what first looks like a densely packed mineral surface. Moving the light across it reveals changing points of reflection and makes the small-scale relief easier to follow. This example comes from the David Vince Collection. Its documented history complements an association that is of interest to both locality and systematic collectors. A group of secondary lead minerals gains depth when the chemical differences between its species are recognised, and this specimen offers that opportunity while retaining a named mine and a clear collection connection.