What is this?

[Earth]

Would this be sea glass? Delaware Beach...Thanks!!

 

[Eu_citzen]

Possible. Beach glass typically has air bubbles and is scratched by quartz.

 

[smokeythecat]

Quartz pebbles. They come down the Delaware river and some are GORGEOUS. I have some from the Delaware beaches also. Some are so clear they could be faceted. Nice finds, hard to get that clear.

 

[DDancer]

I agree it looks like its a quartz pebble. As EU pointed out glass usually has air bubbles. A hardness test would put that to bed. Also as smoky says its difficult to find good clear specimens.