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Also known as crystalline solid

thumb|upright=1.25|Crystals of amethyst [[quartz]] thumb|upright=1.25|Microscopically, a single crystal has atoms in a near-perfect periodic arrangement; a polycrystal is composed of many microscopic crystals (called "[[crystallites" or "grains"); and an amorphous solid (such as glass) has no periodic arrangement even microscopically.]]

AI overview

A crystal is a solid material in which atoms are arranged in a highly ordered, repeating pattern throughout the structure. Crystals matter because their atomic organization gives them distinctive properties—such as specific shapes, hardness, and optical qualities—that make them useful in everything from jewelry to electronics and scientific research.

AI-generated from the Wikipedia summary — may contain errors.