(1) The constituent particles like atoms, ions or molecules of the crystal can be arranged in seven different ways changing edges (a, b, c) and angles (α, β, γ) and accordingly they form seven systems or types of the crystal.
(2) These seven crystal system are named as :
(a) Cubic system,
(b) Tetragonal system
(c) Orthorhombic system
(d) Rhombohedral system
(e) Monoclinic system
(f) Triclinic system
(g) Hexagonal system.
