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Identity HelpWhat is this?

12th Jan 2018 13:28 UTCMario Stieger

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?

12th Jan 2018 13:36 UTCReiner Mielke Expert

Is it magnetic? If not I would say it is pyrite pseudomorph marcasite assuming the ridges are sulphide and not limestone ( a fossil).

12th Jan 2018 14:09 UTCWayne Corwin

Welcome to Mindat Mario.

What does the bottom side look like?

12th Jan 2018 14:49 UTCPeter Slootweg 🌟

It looks ike a pseudomorph of pyrite after pyrrhotite. I have no idea what the grey stuff on top might be.

12th Jan 2018 14:51 UTCPaul Brandes 🌟 Manager

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.....

12th Jan 2018 16:23 UTCUwe Kolitsch Manager

The grey stuff could be marcasite. Alternatively, a carbonate. You could do some simple tests.

12th Jan 2018 18:43 UTCJan Čermák

Hi Mario,

classic pseudo of pyrite after pyrrhotite. Maybe with some arsenopyrite. On the top (greyish) probably ankerite-dolomite series impregnated (covered) with plumosite

13th Jan 2018 07:03 UTCVolkmar Stingl

Another vote for pyrite after pyrrhotite!

13th Jan 2018 09:57 UTCMario Stieger

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!

13th Jan 2018 16:13 UTCDonald B Peck Expert

Those top two photos sure look like some body doing brick work dropped mortar into gravel fil !!! :<}