Freshwater clam or mussel?

Freshwater clam or mussel?

Observation - Freshwater clam or mussel? - Global. Description: This was found on the shore of the lake, near one of the fishing pontoons. I have also found another one (smashed) on the other side of the lake, which might have been taken by a mink. I am secretly hoping that it's a freshwater pearl mussel (although it

This was found on the shore of the lake, near one of the fishing pontoons. I have also found another one (smashed) on the other side of the lake, which might have been taken by a mink.
I am secretly hoping that it's a freshwater pearl mussel (although it will be VERY unlikely)!