Crystal systems are a classification of crystalline materials based on their symmetry and the arrangement of their atoms in a periodic structure. Each crystal system is defined by a set of lattice parameters, which include the lengths of the unit cell edges and the angles between them. There are seven primary crystal systems in three-dimensional space: 1. **Cubic (or Isometric)**: All sides are equal in length, and all angles are 90 degrees. Example: Sodium chloride (table salt).
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