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Black mineral vein in uralite porphyry (?)
  
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Kara




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PostPosted: Oct 22, 2018 12:43    Post subject: Black mineral vein in uralite porphyry (?)  

Hello again!

I have been told this multicolour rock from Finland might be an uralite porphyry with vein of at least quartz and epidote. No-one has any idea what the black mineral vein in it is. It can be easily scrathed with steel.

It is one single rounded rock which had broken to pieces when I found it. Please can you tell me something of this rock and possibly its minerals?

Thank you very much! - Kara



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Kara




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PostPosted: Oct 22, 2018 12:49    Post subject: Re: Black mineral vein in uralite porphyry (?)  

... and here the black mineral. It looks almost leathery from the surface. Can be scratched with a nail, and streak in porcelain is grey.

Can take better close-up pictures if needed.



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Pete Modreski
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PostPosted: Oct 22, 2018 13:38    Post subject: Re: Black mineral vein in uralite porphyry (?)  

I think one would be just guessing, as to what this is, without some kind of more serious physical/chemical tests on it!

Uralite porphyry does sound like a good description of what this host rock is; it looks like an igneous rock, looks altered, and uralite (green alteration of actinolite after diopside) sounds like a good likelihood for what it is.

But for the black vein--just some possibilities that come to mind...
magnetite/ilmenite/hematite
manganese oxide(s)
copper oxide (tenorite?)
radioactive oxides (uraninite?)

And probably more possibilities!
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Kara




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PostPosted: Oct 22, 2018 14:00    Post subject: Re: Black mineral vein in uralite porphyry (?)  

Thank you Pete very much! It helps a lot to have some alternatives to look for. The black scratches glass, but can easily be scratched with a knife blade. It really looks and feels like old dull matt leather :) .

Here one more photo of the uralite host rock.

EDIT: not magnetic.



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