Hi,
Many years ago I found a small strange piece of "rock". I have never seen anything like it, although I can't say I've been looking that much for any others.
Anyway, I am curious what it is.
It is dense and solid like a stone, it's mostly black and somewhat smooth, possibly a bit brownish black. It has some strange brown features under that dark cover, the outermost layer is brown and very smooth. Under the thin smooth brown layer is is still smooth and brown but a much lighter brown.
Here is a picture of it: http://img269.imageshack.us/g/cimg1256k.jpg/
I think it was found somewhere in Sweden, but I can't remember where. Any ideas? I have some thoughts of what it may be, but as I know very little of the subject I better save them for a few posts as to not influence you with my thoughts.