Enargite Butte, Butte District, Silver Bow Co., Montana 7.84cm x 4.77cm x 4.7cm Ex. A. J. Beres Collection No. 1479

Description/Interesting Notes: A most unusual example of enargite from Butte!!! This specimen consists of a matrix of massive enargite and pyrite that hosts numerous small enargite crystals perched across its surface!!! What is most striking about this specimen however, is that it hosts a rare trilling twin enargite crystal prominently perched on its face!!! This trilling exhibits amazingly sharp twinning that is very rarely seen in the species!!! The other enargite crystals throughout the specimen exhibit complex features and there are several other complex twins as well!!! The crystals exhibit an additional curious feature as well - most of the enargite crystals host what is believed to be tennantite on their terminations!!! Upon close examination, these tennantite crystals have triangular features and a compressed, somewhat flattened habit!!! This specimen is simply incredible when viewed with a loupe or scope!!! Enargite trillings are very rare indeed!!! This specimen is from the collection of A.J. Beres and retains an antique dealer label as well (this habit is so unusual that it was labelled as bournonite? from Butte)!!! The pics hardly do it justice!!! Must be seen in person to be fully appreciated!!! Good luck and be sure to check out my other exciting mineral auctions on ebay!!! STAY TUNED!!! MORE AUCTIONS WILL BE ADDED MONDAY NIGHT FOR A SPECIAL 3-DAY AUCTION, ENDING THURSDAY MARCH 31st!!!

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