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Identity Helpmolybdenite & magnetite from Norway: more detailed locality?

28th Jul 2022 15:43 UTCAndré Heyninck

Hi everyone

This is a Norwegian piece with molybdenite and magnetite. This is a piece I traded. I hope I can find out the location with your help. Thanks in advance

Questions Answered
Can it scratch glass? : Yes
Can you scratch it with your fingernail? : No
Is it light/heavy for the size? : Heavy

28th Jul 2022 16:06 UTCHerwig Pelckmans

Can a manager please modify the title of this thread, so it will get more attention from people familiar with Norwegian minerals?

Something like "Nice molybdenite & magnetite from Norway: more detailed locality ?"

André, please provide us with the dimensions of this nice specimen, so we have a better idea of how large those molybdenite "flakes" are ...

Cheers, Herwig

28th Jul 2022 16:09 UTCKevin Conroy Manager

You may want to contact: https://www.mindat.org/user-3923.html

30th Jul 2022 12:13 UTCAndré Heyninck

Hi Kevin,

Good idea. I sent an email to after your information

The Evje og Hornnes geomuseum, Fennefoss

Thanks

André

30th Jul 2022 12:20 UTCKevin Conroy Manager

Great, hopefully they'll have an answer for you!

28th Jul 2022 16:22 UTCAndré Heyninck

The piece of magnetite with molybdenite measures 10x5.5x1.8cm and weighs 275 gr. The molybdenite flake measures 1.2 cm.

5th Sep 2022 10:44 UTCAndré Heyninck

During the weekend I had contact with Lars and he sent me the following about this mineral.

"I have checked with a Swedish mineralogical database and found a similar piece. This is said to come from a mine close to Fagersta in Sweden. The name of the mine is not given."

So this piece comes from Fagersta, Sweden and not from Norway as first thought.

That's how my problem is solved. Thanks everyone for the help.

André

5th Sep 2022 14:01 UTCJohan Kjellman Expert

André,

Even though I don't refute this attribution, I think the "identification" is problematic.

A guy called "Lars" (surname?) have found a "similar piece" (by comparing what exactly?) in a "Swedish mineralogical database" (which database?)

cheers

20th Sep 2022 14:44 UTCAndré Heyninck

Hi Johan. More information of the piece magnetite-molybdenite.

Hi André H

I have asked a friend who knows the mines and quarries in the Fagersta area very well, He doesn't knows of any iron mine with the combination of iron ore and molybdenite in that area. However only that molybdenite can be found with garnet skarn.

All the best, Allan Ekberg -

Hi Allan,

I suppose you have the SMIDA/SAMLA database.

When searching on “Photos of Molybdenit” I found a similar piece with Molydenite in Magnetite and the location says “outside Fagersta”.

This is the new information I have.

Best regards

André

20th Sep 2022 18:44 UTCAlfredo Petrov Manager

There are several old iron mines in the Hudson Highlands of New York which have molybdenite embedded in massive magnetite. Perhaps in Norway too there is more than one location for this species combination. Better to leave the photo just under "Norway", and add the possibilities/assumptions for more specific localities in the text of the caption, rather than adding Fagersta as if it were certain.

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