Difference between sea salt and black salt please

Indian black salt is just rock salt mixed with a small quantity of herbs (Amla and Haritaki) added and then heated. There is not one atom of evidence to indicate that it is any more or less healthy than any other type of salt for cooking. It has not been tested by the FDA and any claims sellers may make are not based on scientific facts. Any perceived benefits are almost definitely from the placebo effect. (You feel better because you think you are going to feel better)

The salt formed by drying up of sea water ,on land is called sea salt. It is this natural salt we use most.

The salt collected on earth from natural sources is called rock salt (black salt?).

I never heard of black salt. Is this the next yuppie fad?