Many crystals are formed from minerals dissolved in liquids, particularly in a process called crystallization. Here's how it works:

* Dissolving: Minerals dissolve in a liquid (often water), forming a solution.

* Saturation: As the solution becomes more concentrated with dissolved minerals, it reaches a point of saturation.

* Crystallization: When the solution cools, evaporates, or is otherwise disturbed, the dissolved minerals begin to precipitate out of the solution and arrange themselves in a repeating, three-dimensional pattern, forming crystals.

Examples:

* Salt crystals: Formed from the evaporation of seawater.

* Quartz crystals: Can form from the cooling of magma or hydrothermal fluids.

* Gemstones: Many gemstones like diamonds, rubies, and sapphires are formed deep underground through the crystallization of minerals.