Found when metal detecting

Hi there , i was out on a metal detecting hunt and was digging a target when i noticed something shining about a foot away. Once i retrieved my target i tried to dig out the small shiney thing out and a lot more ground moved than expected and this strange cluster was revealed.

Has the shine of glass on some surfaces but totally opaque, and other surfaces look like resin.

It has what looks like volcanic airated stone in the centre cutting all the way through.

Very very sharp i have lots of small scalpal skits over my fingers from handling

Bottle green solid opaque

Not transparent in anyway

No light can be seen coming through.

Any help would be much appreciated as i have searched through hundreds of possibilities from , obsidian to jade to meteor.

Thanks

Darren