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Mineral ExchangesNorwegian minerals
18th May 2010 22:12 UTCOivind Thoresen Expert
I.E
Fluorite Kongsberg
Harmotome Kongsberg
Cyprine Øvstebø Sauland
Best regards
3rd Jun 2010 15:08 UTCbill wall
10th May 2021 19:13 UTCRolf Egberink
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
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
12th May 2021 14:02 UTCRolf Egberink
If not I will make a dedicated post about his.
Regards, Rolf
12th May 2021 21:00 UTCKnut Eldjarn 🌟 Manager
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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