Is this the right salt?

This was the only thing I could find and thought I'd ask here before using it..

Sea Salt Fine Crystals
Ingredients:
Sea Salt
Magnesia
Anti-Caking agent
E535


I doubt its the right stuff. But everything else said "refined" and still had other ingredients in it. I didn't see anything that was pure salt.

Oh well. At least I'll get my $3 back.