A crystal system classifies crystals by their point-symmetry properties. The conventional three-dimensional classification has seven systems: triclinic, monoclinic, orthorhombic, tetragonal, trigonal, hexagonal, and cubic.
This is distinct from counting the fourteen Bravais lattices, which also distinguish allowed lattice centerings. A unit-cell drawing gives a convenient coordinate description, but symmetry, rather than merely an arbitrary choice of cell lengths, determines the crystal system.
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The crystal system is a classification of crystals based on their internal symmetry and geometric arrangement. In crystallography, scientists categorize crystals into seven distinct systems according to their unit cells—the smallest repeating unit that reflects the symmetry and structure of the entire crystal. The seven crystal systems are: 1. **Cubical (or Isometric)**: Characterized by three equal axes at right angles to each other. Example: salt (sodium chloride).
