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Mineral ExchangesNorwegian minerals

18th May 2010 22:12 UTCOivind Thoresen Expert

I'm interested in good old classic Norwegian minerals. Do you have any nice specimens in your collection you want to swap away, please take contact.


I.E

Fluorite Kongsberg

Harmotome Kongsberg

Cyprine Øvstebø Sauland


Best regards

3rd Jun 2010 15:08 UTCbill wall

write me at wwalljr@triad.rr.com on swapping

10th May 2021 19:13 UTCRolf Egberink

07337270017061966743250.jpg
Dear Mr Thoresen,

I have nothing to swap or sell to you, but I would like to ask you to look at a specimen from Buskerud area (as the label stated). Unfortunately I cannot find anything alike this specimen on Mindat. Maybe you can identify it as being an expert in Norwegian minerals. Thank you in advance.  Rolf Egberink

weight 224 g | 98 x 62 x 38 mm
definitely quartz on there, I think the black is hornblende and the orange-brow crystal look like weathered garnets or another iron-bearing mineral. The blue is labeled as indigolite/tourmaline but is incorrect in my opinion. 

Ofcourse I can send you more pictures or a video. r.egberink@kpnmail.nl 

11th May 2021 01:50 UTCFrank K. Mazdab 🌟 Manager

This post should really have its own thread, not only because it's way off-topic here and piggy-backing on an 11-year old thread, but more importantly because it'll get a lot more visibility from all the membership, including other collectors knowledgeable about Norwegian minerals. If you want to contact Oivind specifically, you might want to try sending a private message to him (although as it appears external notifications of those don't exist, it could be hit-or-miss when an infrequent poster might see it).

That all said (and it's an interesting-enough looking specimen that a dedicated thread about it will probably generate a lively set of responses), your "orange-brown crystals like 'weathered' garnets" look a bit like a helvite-group mineral to me (as best as I can tell from this one photo), and if so then the black crystals could be aegirine? (and the blue maybe fluorite?)

Give this specimen its own thread and include some additional close-up photos (taken not in your hand, but sitting on a neutral-colored matte surface like a piece of white paper; several good photos would be way preferable to video that may be difficult to keep in focus), and not only might your mineral IDs perhaps be confirmed or enhanced, but then some possibilities for a likely locality may follow. If a helvite-group mineral is indeed present, there are a number of former Buskerud (I think now "Viken") localities for that family; I myself have genthelvite labeled from "Buskerud".

11th May 2021 16:14 UTCPaul Brandes 🌟 Manager

And, sadly, we don't have the ability to move topics/posts like we used to.....

12th May 2021 14:02 UTCRolf Egberink

Thank you for your reaction. I replied to his post because I was looking for a Norwegian expert specifically. Unfortunately I had no response on an earlier post I did on Facebook Mindat Community so I tried it this way. I will look into your insights about the crystals. I am in contact with Mr Thoreson now so hopefully he can help me out. 
If not I will make a dedicated post about his. 

Regards, Rolf

12th May 2021 21:00 UTCKnut Eldjarn 🌟 Manager

Rolf,

The specimen seems to host pyrite, partly decomposed to goethite with an amphibole in quartz. (Please look closely at the cleavage angles. If 60/120 it is clearly an amphibole - if close to 90, it would be a pyroxene and could be aegirine (acmite)). If you can confirm the specimen as an amphibole, it is a common assemblage that could have originated from many areas in the Precambrian rocks of Buskerud (now Viken) in Norway. I cannot suggest a specific locality. IF it is aegirine (acmite) it would probably be from Rundemyr in Eiker within the Permian Oslo-region.
Knut
 
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