Refined salt is sodium chloride. It's white. Unrefined salt is usually colored, either gray or other colors, because it has other stuff in it.
Even animals seek out salt. We all need salt. Even paleo man had plenty of salt because he consumed the blood of animals, which is rich in salt. The word "salary" has as its base the base word for salt because in ancient times workers were paid in salt. Salt is important and good, especially if your diet is lower in carbs than the typical SAD diet. Your body just doesn't retain as much salt when it's not stuffed with grains.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
Starting squat: 45lbs. Current squat: 180 x 2. Current Deadlift: 230 x 2