"Unrefined salt" refers to salt that has not undergone any processing or refinement. It is in its natural state and often contains minerals and other impurities. Full definition
It is critical to our health that we keep these excellent fats on hand for everyday cooking, along with unrefined salt such as Celtic, Himalayan, or Real Salt. (westonaprice.org)
Note: It's important to use plenty of unrefined salt in any fermentation but especially in one where we're hoping for quick culturing action. (realfoodoutlaws.com)
Use unrefined salt for a good source of magnesium and trace minerals, as well as of sodium and chloride. (westonaprice.org)