Throughout the world there are different types of salts used by many diverse cultures to produce various flavors. Gray salt, also spelled "grey" salt, is one of these many culinary salts.
Composition of Salt
The basic chemical composition of salt is sodium chloride (NaCl), which is also known by the mineral name "halite."
Features of Gray Salt
Gray salt is light gray to grayish purple in color. This color comes from the clay it is mined from. Gray salt is moist.
Other Names
Gray salt is also know as "sel gris" and "Celtic sea salt." It is a kind of Celtic sea salt.
Nutrition
Among sea salts, gray salt is considered to have the highest amount of magnesium.
Source
Gray salt is commonly mined on the coasts of France in Guérande, Brittany. It is mined using traditional methods.