I found this 'rock' on the beach in North West Washington State.
It's almost perfectly round save for a few bumps, it's dark grey in colour, solid, feels smooth like any stone you'd find on the beach, and a little grainy in some places.
It's not metallic or magnetic, it's about a 6 on the hardness scale, and it's very heavy.
It seems to have 'seams' like natural cracks, but it's not frail.
Nothing chips off.
I just have no clue, and I'm worried that cutting it open to see what's inside might ruin whatever it is.