Mimetite
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Mimetite from Santa Eulalia, Chihuahua, Mexico, measuring 54 × 42 × 38 mm and weighing 71 grams. A good example of one of the signature secondary minerals from this major Mexican mining district.
Mimetite is lead chloroarsenate, Pb5(AsO4)3Cl, hexagonal, usually forming as botryoidal crusts, barrel-shaped crystals or the distinctive rounded 'campylite' habit, in yellow, orange or brown shades, developing in the oxidised zone of a lead deposit where arsenic released from weathering sulfides combines with lead. Santa Eulalia is one of Mexico's great silver-lead-zinc districts, a large carbonate-replacement and skarn system whose extensively oxidised upper levels have produced Mimetite alongside Adamite, Wulfenite and a long list of other secondary species that have made the district a mainstay of serious secondary-mineral collections.
A well-formed Santa Eulalia Mimetite holds its own among the district's many well-known secondary species, and a piece of this size is a solid, representative example. This piece is from the David Vince Collection.