Cubic lattice with an extra atom at the center.
Face-centered cubic with half of tetrahedral voids occupied (e.g., Diamond, Si).
Complex hexagonal packing sequence (ABAC).
Cubic lattice with extra atoms at the centers of all faces.
Standard hexagonal lattice.
Efficient packing of spheres in a hexagonal arrangement.
One axis not at 90°.
Three unequal axes at 90°.
Primitive cell with three equal axes and three equal non-90° angles.
Simple cubic lattice with atoms only at the corners.
Two equal axes at 90°.
No axes at 90°, all axes unequal.
Standard categories of crystal lattices and their packing arrangements.