seven crystal systems (cell parameters a, b, c, alpha, beta, gamma),
Parameters to describe a unit cell: Six parameters are required. These are the three basic vectors along three crystallographic axes(a,b, and c) and three angles between the crystallographic axes(α,β,γ).
Based on the presence of certain rotation axes in the unit cell, crystals can be classifed into seven categories
Triclinic
Monoclinic
Orthoclinic
Trigonal
Tetragonal
Hexagonal
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