Before revision: Interplanar spacing The spacing d between adjacent (hkℓ) lattice planes is given by: Cubic: Tetragonal: Hexagonal: Rhombohedral : Orthorhombic: Monoclinic: Triclinic: Classification by symmetry The defining property of a crystal is its inherent symmetry.
After revision: (primitive setting)Interplanar spacing The spacing d between adjacent (hkℓ) lattice planes is given by: Cubic: Tetragonal: Hexagonal: Rhombohedral : Orthorhombic: Monoclinic: Triclinic: Classification by symmetry The defining property of a crystal is its inherent symmetry.