Tennessee Historical Commission marker at the north end of McSween Memorial Bridge (US-321) in Newport, Tennessee. The sign recalls the location of War Ford, 0.2 miles to the east along the Pigeon River. The ford was an important crossing along the Great Indian Warpath.
Definition: a substance in which the constituent atoms, molecules, or ions are packed in a regularly ordered, repeating three-dimensional pattern. Most crystals are solids.
A crystal structure (an arrangement of atoms in a crystal) is characterized by its unit cell, a small imaginary box containing one or more atoms in a specific spatial arrangement. The unit cells are stacked in three-dimensional space to form the crystal.