Unlike sea salt which is extracted from salt ponds, Persian blue salt is a salt fossil or gem, whose crystals were formed 100 million years ago in the Pre-Cambrian seas. It is extracted from a single mine in the northern province of Semnan, Iran. The color is a result of the way the salt crystals refract the light. The reason for this refraction is due to the extreme pressure with which the salt was formed millions of years ago.
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