Most likely slag, but from a very interesting location in England (Bumble Hole), kindly lugged all the way over here by Kelan, a friend of my daughter.
Very interesting material. Could be from some smelting foundry in England as the area was an industrial hub for iron and other metal productions from the 1700's onward (Foundries there supplied the chains and ankers for the Titanic).
Definitely behaves like glass, breaks and flakes like it, ant is just as annoying to ones fingers. Had several splinters stuck in my hand by the time I had cut the first face.
There is also the distant possibility of it being natural and hence obsidian, as the area has been known as a source of minerals usually bordering obsidian. And presence of volcanic activity in the past makes that a possibility too.
ppkelan2 by
Kainzer Kurt, on Flickr
Glassy braking surfaces, and a golden sheen coming from under the skin (likely internal fractures).
ppKelan1 by
Kainzer Kurt, on Flickr
Tried to get a cut-off to test material, but cant make up my mind which side to use, so turns into a pendant. :) :) :)
ppkelan3 by
Kainzer Kurt, on Flickr
Any info on possibilities, will be highly appreciated, Kurt