Crystals

Crystals are solid materials whose atoms, ions or molecules are arranged in a regular, repeating pattern in every direction. This highly ordered internal structure gives crystals many of their characteristic shapes, with flat faces and well-defined angles. Crystals can form naturally when minerals slowly grow inside rocks or when dissolved substances crystallize as water evaporates.

They can also be produced in laboratories and factories for scientific and industrial uses. Common examples include table salt, sugar, snowflakes and quartz. Although sugar and salt crystals may look similar at first glance, they are made of different substances with different internal structures and properties. The size and shape of a crystal depend on factors such as temperature, pressure, available space and the speed at which it grows.

Crystals have many practical uses because their ordered structure gives them special physical properties. Quartz crystals vibrate at a very precise frequency when an electric voltage is applied, making them useful in clocks, watches and many electronic devices. Silicon crystals are the foundation of most computer chips and solar cells.

Gemstones such as diamonds, rubies and sapphires are also crystals valued for both their appearance and their hardness or other physical characteristics. Scientists study crystals to better understand the structure of materials, develop new medicines and design advanced technologies. Crystal growth is also an important area of research because even tiny changes in the arrangement of particles can affect the strength, transparency, electrical behavior or other properties of a material.