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Sierra de Umango, Villa Castelli, General Lamadrid department, La Rioja, Argentina

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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 the Sierra de Cacho, a parallel mountain range just to the west of the Sierra de Umango, and separated from it by a long valley including the two Barreal salt flats.

The source of this error seems to have been the mine engineer Emilio Hünicken, ex-student at the Clausthal Mining Academy, who provided the first specimens of "Sierra de Umango" eucairite, tiemannite and what would become umangite to Klockmann around 1890. (Klockmann, F. (1891) XVIII Mineralogische Mitteilungen aus den Sammlungen der Bergakademie zu Clausthal. 1. Über einige seltene argentinische Mineralien. Zeitschrift für Kristallographie, 19, 265-275.)

Mineral List

9 entries listed. 3 valid minerals. 6 erroneous literature entries.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Klockmann, F. (1891) XVIII Mineralogische Mitteilungen aus den Sammlungen der Bergakademie zu Clausthal. 1. Über einige seltene argentinische Mineralien. Zeitschrift fuer Kristallographie 19: 265-275.

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