Each salt is a beautiful cube with a smooth surface and a side length of about half a millimeter. Such a surface will reflect light like a mirror. If you move this pinch of salt under the light, your eyes will see the reflected light of different salts. The common seasoning in the salt tank is actually composed of countless miniature sculptures, each of which has the same shape.

This is not the result of the salt maker's intention-salt will naturally form a regular shape, from which we can see the clues of material structure. The chemical composition of salt is sodium chloride, and the amount of sodium ion and chloride ion is the same.

You can think of them as balls of different sizes-the diameter of chloride ion is almost twice that of sodium ion, and each ion will have a fixed position in a specific structure during the process of salt formation.

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