The face centered cubic (FCC) unit cell begins with a totally different layer ... difficult to pin point the actual unit cell from the lattice, let's cut some of the atoms from the end of the lattice ...

The simple cubic unit cell is delineated by eight atoms, which mark the actual cube. These are corner atoms, so each one only contributes one eighth of an atom to the unit cell, thus giving us only ...

(Top diagram) Diamond is metastable at room temperature and has a diamond cubic crystal structure. (Lower diagram) The diamond cubic structure is a face-centered-cubic lattice with a basis of two ...

The structure has face-centered cubic symmetry, and is a little heavy to understand ... The first way to think of the spinel structure is the array of Al atoms. They sit on the corners of tetrahedra ...