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Improving Mindat.orgNickelskutterudite do you have proof?
13th Feb 2009 22:30 UTCReiner Mielke Expert
Recently there have come on the market specimens from Rusty Lake Mine in Leith Tp. labelled Nickelskutterudite. None of these have been XRD'd that I know of and of the samples tested from that mine in 1971 no Nickelskutterudite was found. I have personally collected at that same mine and found Skutterudite crystals to be relatively common, but considering the 1971 study, I would not have called then Nickelskutterudite without XRD.
This brings me to the question. "Has anyone XRD'd their samples of "Nickelskutterudite" from Cobalt-Gowganda?" If not then you should not be calling it Nickelskutterudite, rather Skutterudite. For example see: http://www.mindat.org/photo-191736.html
14th Feb 2009 18:25 UTCUwe Kolitsch Manager
16th Feb 2009 19:39 UTCUwe Kolitsch Manager
(...)
However, the 1971 paper cited may well be out of date. I have seen several reputable dealers
selling Chloanthite and Nickelskutterudite from the Cobalt-Gondwana Area in the last 20 years.
One of these is Excalibur Minerals which is an internationally known supplier of rare species that
have been analytically confirmed and used as reference specimens for museums and universities.
They currently list specimens of Silver with Nicelskutterudite from the Cobalt-Gondwana area.
They have extensive and state of the art in-house analytical equipment to ensure the accuracy
of their identifications. The conclusion must therefore be that if L.G. Berry did not find any
Nickelskutterudite in his studies of Cobalt-Gondwana minerals prior to 1971, then other people
have found it since then.
18th Feb 2009 01:07 UTCReiner Mielke Expert
There are probably still a lot of specimens out there that were collected prior to 1971 and are still labeled Chloanthite. The fact that a reputable dealer is selling it as such is irrelevant. There were may reputable mineralogists and museums in existence prior to 1971 and for whatever reason they mistakenly identified Skutterudite as Chloanthite probably is still in play today. It is possible ( but very unlikely) that some Nickelskutterudite has been found post 1971, but all specimens labeled as Nickelskutterudite are suspect until proven by XRD to be such.
18th Feb 2009 02:47 UTCFrank Keutsch Expert
If the specimen is close to endmember Co or Ni SEM/EDS is sufficient. If Co and Ni are comparable this method does not suffice as it is only semi-quantitative (which is just a nice way of saying not quantitative), but it could prove useful.
Frank
18th Feb 2009 14:38 UTCReiner Mielke Expert
I hope that people with "Nickelskutterudite" will take you up on the offer. I personally have no Nickelskutterudite in my collection. I have lots of what I assume is Skutterudite, but I don't imagine you want to go on a hunt for Nickelskutterudite. If you do, let me know and I will send you a bunch of samples. According to the 1971 study most of the Skutterudite has a Nickel:Cobalt ratio of less than 1:3. However, there were a few analyses as high 2:3. Iron is also a significant component in the Skutterudite and is found in concentrations as high as the nickel. Hopefully you will be able to help resolve this issue. I am hoping that some Nickelskutterudite will turn up as it will make collecting there more interesting.
Reiner
13th Mar 2009 18:24 UTCReiner Mielke Expert
I
13th Mar 2009 19:42 UTCUwe Kolitsch Manager
22nd Feb 2012 21:14 UTCTony Nikischer 🌟 Manager
Tony Nikischer
Excalibur Mineral Corp.
23rd Feb 2012 01:50 UTCReiner Mielke Expert
23rd Feb 2012 23:44 UTCBart Cannon
Shiny xls occur on silver.
~Bart
24th Feb 2012 01:01 UTCReiner Mielke Expert
24th Feb 2012 02:53 UTCDon Saathoff Expert
Don
24th Feb 2012 12:28 UTCDavid Von Bargen Manager
24th Feb 2012 14:19 UTCFrank Keutsch Expert
Frank
24th Feb 2012 14:37 UTCReiner Mielke Expert
Also it took me three tries to find a nickel-skutterudite sample from Germany, the first two turned out to be skutterudite even though they were labeled chloanthite, so you can not trust the labels.
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