Sodium chloride, or table salt, has a cubic crystal structure. But the salt we use for cooking normally looks more like sand.
Indeed, table salt is often used in kids’ experiments to demonstrate crystallization. It’s a simple activity, but the results are disappointing. Many tutorials online make it look far easier than it actually is.
This is because sodium chloride crystals are very sensitive. Temperature differences cause imperfections. It also crystallizes easily on dust particles, growing misshapen clusters, hopper crystals and dry crust.