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...
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