There is a lot more than clausthalite in here. I am told that if you have purple (and you do, visible, here), you have umangite; and it’s a good bet there is klockmannite as well, and potentially all kinds of other good things. This specimen also contains Copper selenides because of the green secondaries. The non-metallic blue on there is likely chalcomenite, in fact. These specimens were presented to the academy by Casimiro Domeyko, who did much work on the rare minerals of Chile and Argentina. Ex. Academy of Natural Sciences Philadelphia Collection.
Attribution: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
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{{en|1=Umangite, Clausthalite
:: Locality: Sierra de Cacheuta, Mendoza, Argentina ([http://www.mindat.org/loc-19910.html Locality at mindat.or