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PhotosGjerdingselva - wrong locality
8th Apr 2023 05:11 UTCOT. Ljøstad Expert
8th Apr 2023 16:30 UTCUwe Kolitsch Manager
8th Apr 2023 22:10 UTCFrank K. Mazdab 🌟 Manager
The photo indicates a locality for which the first listed mineral is indeed found, as are the accompanying minerals. So the mineral list and the locality are internally consistent. So is the first mineral incorrectly identified? If that's the reason the sample is from the wrong locality, then the issue is primarily a mineral ID problem, and only a locality problem secondarily.
But if not that, then otherwise, what is it about it about this sample that indicates it should be from a different locality?
9th Apr 2023 09:52 UTCThe Evje og Hornnes geomuseum, Fennefoss Expert
I personally collected in the Solumsåsen quarry several times, and yes, what I found is seemingly identical to what is shown on this picture.
I also collected at Gjerdingen several times, and did not find anything resembling the picture here. The rock is lighter in colour, generally white, more coarse grained, and the cavities tend to have sharper edges, and are not lined with these platy albite crystals.
Hopefully other Norwegian experts can confirm this too.
Ron Werner
Evje og Horness geomuseum Fennefoss
9th Apr 2023 10:21 UTCFrank K. Mazdab 🌟 Manager
OK, so it seems other than the obvious anatase, the minor accompanying mineral IDs were wrong.
The original photo caption stated that anatase is present (this in not disputed), and "on closer examination", two other minor minerals characteristic of Gjerdingen were also identified. These were apparently only visually identified, although both are part of more complex mineral families and thus would not seem like they could be easily visually identifiable.
But I'm very concerned by how this has been "resolved".
The original photo caption stated that anatase is present (this in not disputed), and "on closer examination", two other minor minerals characteristic of Gjerdingen were also identified. These were apparently only visually identified, although both are part of more complex mineral families and thus would not seem like they could be easily visually identifiable.
With the locality then challenged, the two "on closer examination" minor minerals have suddenly changed identity (but not in response to any suggestion as to what the minor minerals might have been), and the location has been changed to what was suggested in the challenge. And the two new "on closer examination" minerals are no more visually identifiable than the original two.
And that the locality was changed without comment suggests the original locality was never even confidently known or trusted, which makes me wonder if the original "on closer examination" minerals were simply identified by wishful thinking. And that the new "on closer examination" minerals may be a guess too?
EDIT: The photo already appears to be "user gallery" only. Although the locality and mineralogy have been changed, I recommend that the reviewing manager or photo reviewer not return the photo to the public galleries without further explanation from the owner.
9th Apr 2023 10:33 UTCThe Evje og Hornnes geomuseum, Fennefoss Expert
9th Apr 2023 10:52 UTCFrank K. Mazdab 🌟 Manager
What bothers me is how we got here. It's one thing to have a mineral ID incorrect... we see that a lot. It's also not unheard of to have a locality incorrect, although that seems a bit less common because while the original collector might not know what he's found, he better know where he is. But locality labels do get lost, or aren't recorded, or fail to follow their specimen from owner to owner.
But this was a case of a wrong locality listing wrong rare minerals but nonetheless consistent with the locality. It's as if two correct complete labels (minerals+locality) were switched and attached to their wrong specimens. I suppose that happens sometimes too, but I'd like to know that was the issue rather than the disquieting possibility that rare minerals are being guessed or wished for guessed localities. One of the instructions on the photo upload explicitly says "If rare species are shown, you must explain how they were identified." The bolding is not mine! That check was not done here.
9th Apr 2023 11:22 UTCThe Evje og Hornnes geomuseum, Fennefoss Expert
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