Crystal or cut glass is the result of a precise geometric structure of a solid element or compound in chemistry, a bundle of molecules, atoms, or ions.

A crystal is a solid mineral whose components are arranged in a highly microscopic structure, forming a crystal lattice that extends in all directions. Macroscopic single crystals can be classified by their geometric shape, which usually consists of flat faces with specific, characteristic orientations.

The scientific study of crystal formation is known as crystallography. The process of crystal formation through crystal growth mechanisms is called crystallization. Examples of large crystals include snowflakes, diamonds, and table salt.

Most inorganic solids are not crystals but polycrystals; many microscopic crystal components fused together into a single solid. Examples of polycrystals include most metals, rocks, ceramics, and ice. The third category of solids is amorphous solids, in which the atoms do not have a periodic structure. Examples of amorphous solids include glass, wax, and many plastics.

Crystallography is used to measure crystal surfaces and understand crystal symmetry. Its crystal structure is determined by the network and the conditions formed by the crystal.

The largest concentrations of crystals on Earth are part of bedrock by volume and weight. The sizes of crystals found in rocks usually range from one millimeter to several centimeters. But it is possible to see huge crystals.

The world's largest known naturally occurring crystal is a beryl crystal, 18 m long, 3.5 m in diameter, and 380,000 kg in weight, seen in 1999 at Malakialina, Madagascar.

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