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isometric
a=b=c, α=β=γ=90°
hexagonal
a=b≠c, α=β=90° γ=120°
trigonal (hexagonal)
a=b=c, α=β=γ≠90°
tetragonal
a=b≠c, α=β=γ=90°
orthorhombic
a≠b≠c, α=β=γ=90°
monoclinic
a≠b≠c, α=γ=90°≠β
triclinic
a≠b≠c, α≠β≠γ≠90°