Crystal structure - face centered cubic
Crystal structure - face centered cubic (fcc)
The spheres are located at each vertex of the cube, and in the center of the faces.
The spheres in the vertices contribute with (1/8).
The spheres in the faces are cut in half, they contribute with (1/2).
There are 8 vertices and 6 faces, therefore there are 4 complete spheres per unit cell.
Versión en español:
https://www.geogebra.org/m/fpk7djne
Version in French (by Vincent Pantaloni):
https://www.geogebra.org/m/qyvza9hq
Other structures:
Crystal structure - simple cubic:
https://www.geogebra.org/m/rxvmc3uj
Crystal structure - body centered cubic:
https://www.geogebra.org/m/zantmgct