Our Persian sapphire blue salt is one of the most precious and purest salts in the world. Rock salt is extracted by hand from the heart of the Samman salt mines in Iran, the former Persian Empire. It is of marine origin and comes from fossil deposits left by the sea. Its name comes from the sublime intense blue reflections that make it look like a precious stone. This incredibly beautiful blue comes from the sylvinite found in the minerals of the mine, a potassium compound, in which it is very rich. It is not transparent blue, just some crystals are tinged with blue. Very appreciated by fine gourmets, it is also a beauty ally in cosmetics and an air purifier.