Question

how crystal are form

Answer 1

Crystals often form in nature when liquids cool and start to harden. Certain molecules in the liquid gather together as they attempt to become stable. They do this in a uniform and repeating pattern that forms the crystal. In nature, crystals can form when liquid rock, called magma, cools.

Answer 2

when anhydrous powder is cooled in the presence of water it turns into crystals. this process is called crystallization