The "Sierra de Umango" is famous for its selenide-rich hydrothermal vein systems, and gave its name to the selenide species umangite. However, there are no selenides at all in the Sierra de Umango sensu stricto - the selenium mines are all in a smaller range of hills, the Sierra de Cacho, just to the west of the Sierra de Umango, and it is a matter of semantic debate whether these can be considered part of the Sierra de Umango or not.
Mineral List
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