BRAVIAS CRYSTALS -7 CRYSTAL SYSTEMS

Bravias crystals :

There are 7 different basic crystal lattices according to the dimensions (a,b,c) and their angles( ⍺, 𝛽,ℽ ) of unit cell which are called Bravias
crystals. 


1 Cubic crystal system :
                  a=b=c  and α=β=γ=90  example : NaCl
available systems are simple cubic, face centered and body centered cubic systems

2 Tetragonal
               a=b ≠ c and  α=β=γ=90  example SiSO4
available systems : simple and body centered cubic systems.

3 Orthorhombic
                       a ≠ b ≠c and  α=β=γ=90 example: BaSO4
available systems are simple, body centered ,face centered and base centered cubic systems. .

4 Monoclinic (rhombohedral ) 
                  a ≠ b ≠c and  α=β=90γ=120 example:  Na2So4
available systems: siple and bidy centered cubic systems

5 Triclinic
                      a ≠ b ≠c and  α≠β≠γ≠90  example: CaSo4
available systems : simple cubic system only.

6 Trigonal 
                   a=b=c and  α=β=γ≠90 example:  CuSO4,

7 Hexagonal
              a=b ≠ c and  α=β=90γ=120, example:  SiO2
available system: simple cubic crystal system .