Or black agategreenjar said:....to me it looks like black Flint....
May cost you a load of beer tokens as wellm_attt said:cheers guys, both look possible. but finding anything like it for sale is impossible
dw1305 said:Hi all,
I don't think that it is Obsidian or Flint (definitely both black and shiny), because of the bands of quartz. Possibly Gneiss, although I don't think that would look glossy, or most likely a very fine grained Basalt or Gabbro, with a later quartz intrusion?
cheers Darrel