Aluminium Fermi Surface with Castep

aluminium.cell

%block LATTICE_CART
  0.0000000   2.0194648   2.0194648
  2.0194648   0.0000000   2.0194648
  2.0194648   2.0194648   0.0000000
%endblock LATTICE_CART

%block POSITIONS_FRAC
 Al  0.000000  0.000000  0.000000
%endblock POSITIONS_FRAC

SYMMETRY_GENERATE

KPOINT_MP_GRID 9 9 9
KPOINT_MP_OFFSET 0 0 0

BS_KPOINT_MP_GRID 55 55 55
BS_KPOINT_MP_OFFSET 0 0 0

aluminium.param

task : bandstructure
bs_nextra_bands : 2
spin : 0

The image was created in XCrysDen, in which a right-click on the window allows one to change the surface and background colours, amongst other properties.

Al Fermi surface

And the same Fermi surface, with a 3D visualisation dating from the early 1960s. This model is owned by the TCM Group where c2x was created.

Al Fermi surface as physical model