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What is this?

Posted by Mario Stieger  
Mario Stieger January 12, 2018 01:28PM
Do you know what exactly that piece is?
I thought about Pyrrhotite could that be correct? What do you mean?
Its Not magnetic.
Weight: 1585g
Size: 17x13x7cm
Its from Trepca - Kosovo..
And can someone tell me something about the value of the piece?

Edited 2 time(s). Last edit at 01/12/2018 08:03PM by Mario Stieger.
Reiner Mielke January 12, 2018 01:36PM
Is it magnetic? If not I would say it is pyrite pseudomorph marcasite assuming the ridges are sulphide and not limestone ( a fossil).
Wayne Corwin January 12, 2018 02:09PM
Welcome to Mindat Mario.
What does the bottom side look like?
Peter Slootweg January 12, 2018 02:49PM
It looks ike a pseudomorph of pyrite after pyrrhotite. I have no idea what the grey stuff on top might be.
Paul Brandes January 12, 2018 02:51PM
Welcome to Mindat, Mario!

No, I don't know exactly what that piece is, and I doubt anyone else will know either unless you provide some more information about it. What would be nice to know are things like hardness (if that's possible), is it heavy for size, streak colour, is it magnetic, does it have a sulphur odor if rubbed, etc. Reiner might be on the track, but some additional information sure would be helpful.....
Uwe Kolitsch January 12, 2018 04:23PM
The grey stuff could be marcasite. Alternatively, a carbonate. You could do some simple tests.
Jan Čermák January 12, 2018 06:43PM
Hi Mario,

classic pseudo of pyrite after pyrrhotite. Maybe with some arsenopyrite. On the top (greyish) probably ankerite-dolomite series impregnated (covered) with plumosite
Volkmar Stingl January 13, 2018 07:03AM
Another vote for pyrite after pyrrhotite!
Mario Stieger January 13, 2018 09:57AM
Thanks a lot, I think it's pseudo of pyrite after pyrrhotite. That can be very good.
With that you have helped me a lot!
Donald B Peck January 13, 2018 04:13PM
Those top two photos sure look like some body doing brick work dropped mortar into gravel fil !!! :<}
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