shb,
Both sea salts come from the coast of France, so aside from a mineral analysis the could be almost the same.
The Celtic Sea Salt ( comes from the Guérande Salt Ponds in Britagne (Brittany), and the (Lima) Atlantic Sea Salt comes from the salt mashes on the Island of Noirmoutier just south of Britagne.
Four other salts that are popular in macrobiotic cooking are the Gnostic Washed Sea Salt (
http://www.qualitynaturalfoods.com/shopnew/seasalt.html ), Si Salt (
http://www.cybermacro.com/forums/mainold/1158.shtml and Izu Oshima Sea Salt
I'm sure you can find scientific nutritional analysis of all 6 salts, somewhere, but just tasting, seeing, smelling, and testing, should help you determine which is best for you.
In the macrobiotic sea salt producers community, each has it's own high praises and horror stories about the other salts, so maybe trying them all is a good way to determine which one is the best.
Thank you, very much.
Bruce Paine