Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Help/Tips/Tricks shells on seashore? what for?

I just started the game so this is a n00b question: what are those shells on the seashore for? there's no description if they're for crafting or eating.

I keep picking them up....lolz

Some can be eaten, most are just for sale though.

And they give the beach a beachy feel

lolz...ok thanks, I thought about hoarding them, but wasn't sure if they were useful