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LocalitiesÅskagen Quarry, Persberg ore district, Filipstad, Värmland County, Sweden

6th Aug 2011 19:43 UTCSigurd Stordal

If you read the references for the locality, thalenite is not said to be valid, but it's still in the mineral list.

Anyone know why ?

7th Aug 2011 00:43 UTCRonald John Gyllenhammer Expert

Hi Sigurd,

There is a P. Kartashov specimen of Thalénite-(Y) from Åskagen. http://www.mindat.org/photo-205865.html This is the reference mindat has listed for the occurence. There are other references not currently cited that could be used and (or) added. e.g. http://rruff.geo.arizona.edu/doclib/hom/thalenitey.pdf

Ron

7th Aug 2011 00:56 UTCPeter Andresen Expert

I can't find the reference saing thalenite is not valid?

7th Aug 2011 12:04 UTCSigurd Stordal

Read the article by R. Kristiansen about thalenite-like minerals from Åskagen, here it states that what was known as Thalenite from here is in fact iimoriite. Read the online article in swedish, also state that what was named thalenite is iimoriite.

7th Aug 2011 13:13 UTCJohan Kjellman Expert

Kristiansen refers to Nilssen (1971) on the first page, but fails to give the full reference. Suggestions - anyone.

Even though I don't doubt the analytical data - the best would be to analyse the original thalenite material from Sjögren, probably in Stockholm. Doing that would take care of booth the present and the old story of this material.

My view on this is that these altered nodules have a very interesting story to tell, much more interesting than listing mineral A, B. C, etc...

cheers

26th Jun 2017 14:32 UTCReiner Mielke Expert

I recently had analyzed a sample of what was supposed to be Yttrokrasite-Y but the analysis indicates a significant amount of Ta? There do not appear to be any Ta minerals at that locality? Is this an oversight?

27th Jun 2017 20:54 UTCJohan Kjellman Expert

weird,

yttrocrasite from Åskagen?

Ta and Si often get mistaken for each other.

what does the specimen look like?

cheers

27th Jun 2017 22:16 UTCReiner Mielke Expert

I would have thought Si but the minor Ta peaks all match. It looks exactly like Yttrokrasite-Y as in this picture https://www.mindat.org/photo-70550.html

1st Jul 2017 02:43 UTCReiner Mielke Expert

In talking to Kerry, he says the Ta M peak at 1.709 is greatly exaggerated so it is actually a minor component. That would make this a Y and Ti dominant species such as Yttrocrasite-Y.