GENERAL GEOLOGY

Detailed explanation-1: -Isotropical is not a crystal system.

Detailed explanation-2: -A unit cell is the smallest portion of a crystal lattice that shows the three-dimensional pattern of the entire crystal. A crystal can be thought of as the same unit cell repeated over and over in three dimensions. The figure below illustrates the relationship of a unit cell to the entire crystal lattice.

Detailed explanation-3: -A crystal is an arrangement of atoms or molecules in three-dimensional space in periodic and symmetric patterns. On the other hand, the smallest unit having the specific symmetry of the crystal is called the unit cell.

Detailed explanation-4: -Solution : End centered unit cells does not exist in cubic crystal system.