A crystal is a solid material where atoms, molecules, or ions are arranged in a highly ordered, repeating three-dimensional pattern. This internal structure forms a "crystal lattice" that dictates the crystal's distinct flat faces, geometric shape, and physical properties.
Crystals can form naturally (like snowflakes, diamonds, and quartz) or synthetically (like silicon chips used in electronics). They are classified into different systems based on their symmetry and atomic bonding, which dictate how they look and function