GeologyRocks

Could you make a foto of it when it is dry and put a scale for comparision next to it?

The quite big "bubbles" confuse me a bit. Do you have 5 to 10% hydrochloric acid to put a drop on the rock when it is dry?

I have a few things on my mind like silt/sandstones interlayered with claystone or maybe marl but with these very round bubbles I could also imagine a weird kind of furnace slag.

I'll wait for a dry foto.

sorry i foolishly forgot to give an indication if size, the specimin is about the overall size or a 2 pence peice. as for it being dry, it is! it has this very shinny aperance regardless of if it is wet or dry.

No problem at all! Though I'm not from the UK so I have no idea how big a 2 pence piece ise. I assume that's 1 to 3 centimeters..

I am quite amazed to read that it is dry!!! I think that makes it more likely to be a weirdly washed piece of furnace slag. Are you thinking about keeping it? If not you could smash it with a hammer to give us a clue about how it looks in a fresh exposure.

yer its about 2cm dia, I would rather not destroy it just yet.so does anyone else have any . thanks alot for your help

Yep looks like furnace slag to me too... I have seen similar peices of slag in similar colours although not with such a vitreous lustre.

Yes, I think you are both right on furness slag.  Lot of that turning up to baffle people isn't there?  Mind you perhaps a collection of it would be a good idea.  At least it would be unique!!!

John

“Civilisation exists by geological consent, subject to change without notice.” -  Will Durant

A collection of slag could be fascinating - it could be linked to a study of the economic geology and industrial archaeology of an area.