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LocalitiesWellington Mine (Siam Tunnel; Old Oro Tunnel; Mill Tunnel; Liberty Tunnel; Extenuate Tunnel; Wellington Tunnel; Abundance Tunnel; New Tunnel; Oro Shaft), Breckenridge Mining District, Summit County, Colorado, USA

24th Mar 2016 19:48 UTCEric Teot

In addition to the list of minerals for the Wellington Mine I would like to add Stibnite. I collected it on the uppermost dump sometime in the 1990's I know stibnite and rutile, which is listed for the Wellington Mine can be similar in appearance, but this specimen is on a matrix of pyrite and marmatite so I am pretty sure it is stibnite. Nice long crystals.

24th Mar 2016 22:32 UTCKyle Beucke 🌟

Eric,


I am not sure this is sufficient evidence that stibnite should be added to the list. The association of the needles with sulfides doesn't mean these minerals were deposited at the same time (I am assuming this would be your reason for favoring stibnite over rutile). What if rutile occured in a host rock that was later replaced by pyrite and sphalerite? Even if we assume that these needles were a sulfide, what about other possibilities, like jamesonite or zinkenite?


I would think a photograph, analysis, or reference would be needed here. Can you find these specimens, or go back and collect some more?


Kyle

25th Mar 2016 00:31 UTCReiner Mielke Expert

"I am pretty sure it is stibnite." What tests have you performed on it that make you so sure?
 
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