Science glossary film: Crystal

A solid consisting of atoms, molecules, or ions arranged in a highly ordered, repetitive, three-dimensional lattice. Crystals can form in both covalent and ionically bonded compounds, and in pure elements – most metals have crystalline forms. Their highly ordered internal structure is often reflected in their large-scale appearance, with flat surfaces that intersect at well-defined angles.

Crystals can form in both covalent and ionically bonded compounds, and in pure elements – most metals have crystalline forms. Their highly ordered internal structure is often reflected in their large-scale appearance, with flat surfaces that intersect at well-defined angles.