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When a unit in a crystal lattice has lattice points only at its corners ,it is called a simple or primitive unit cell. There are seven types of primitive unit cells among crystal.They are

1. Cubic unit cell

2. Tetragonal unit cell

3. Orthorhombic unit cell

4. Monoclinic unit cell

5. Rhombohedral unit cell

6. Triclinic unit cell

7. Hexagonal unit cell

And, the smallest repeating unit in space lattice which when repeated over and over again produces the complete space lattice.This is called unit cell.

In easy form , The unit cell which do not contain any interior point are called primitive unit cell.

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