Misterious Rock

[IamCurious]

Hi, so today out in a nearby field i found this rock which looks volcanic to me, but i dont have much experience...
Its was found in a field near a city which doesn't have any volcano activity there or even close, in fact the country (Portugal) does not have or had any active volcanoes.
The rock has some shine to it and some iridescent in certain areas.
Please help , i am curious.
Thanks

 

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[DDancer]

Its appearance has that of a very old bit of slag in the second picture. It does not look volcanic but does look like it was in a fire at some time. Its a common practice to burn of trash and other materials and as a result bits of slag and slag like materials tend to show up all over the place. My opinion.