Mimetite
Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
Mineral NameMimetite
Chemical FormulaPb5(AsO4)3Cl
Mohs Hardness3.5
Crystal Systemhexagonal
Lusterresinous
Streak Colorwhite to yellowish-white
Cleavagepoor on {1010}
Fractureconchoidal to uneven
Specific Gravity7.24
Colorsyellowish-green, yellow, orange, brown, white
Transparencytranslucent
Type LocalitySanta Eulalia District, Municipio de Aquiles Serdán, Chihuahua
Mineral GroupArsenates (Apatite Group)
Usescollector, minor lead ore
Associated Mineralsgalena, cerussite, anglesite, limonite, quartz
Rarityuncommon
Description
This specimen displays a vibrant yellowish-green color, forming botryoidal to globular aggregates of small, rounded crystals that cover the matrix.
Geological Context
Mimetite is a secondary mineral found in the oxidized zone of lead ore deposits, typically forming from the alteration of lead minerals in the presence of arsenic-bearing solutions.
