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 …

Mar 28, 2020 · A crystal is a solid material in which atoms, ions, or molecules are arranged in a highly ordered and repeating three-dimensional pattern, known as a crystal lattice.

Nov 7, 2025 · Crystal, any solid material in which the component atoms are arranged in a definite pattern and whose surface regularity reflects its internal symmetry. Crystals are classified in general …

Apr 29, 2023 · Crystals are nothing more than an ordered arrangement of molecules or atoms. Crystals come in many different shapes and sizes, and each one has different characteristics. What they are …

Aug 29, 2025 · A crystal is defined by an ordered, repeating, three-dimensional arrangement of atoms, ions, or molecules. This internal order, known as a crystal lattice, extends throughout the entire solid …

Sep 13, 2019 · Crystals have an ordered structure formed by repeating units of atoms, molecules, or ions. Common crystals you might see include table salt, sugar, snowflakes, and many types of …

Crystals are solid materials where the atoms are arranged in a repeating pattern that extends in all three spatial dimensions. This special arrangement gives crystals their unique shapes and properties.

A crystal can be described by its smallest repeating portion of atoms, which would allow the whole crystal to form if this was tessellated; this smallest repeat is known as the unit cell. For example, in a …

Dec 19, 2024 · What is a Crystal? Learn the scientific definition of crystal used by gemologists and answer some basic questions about what is and is not a crystal.

In scientific terms, a crystal is any solid material with a structured, repeating atomic pattern. This definition encompasses a wide range of substances, from the gemstones used in jewelry to the …