(above) platinum #1 atoms arranged in a face centred cubic pattern
Platinum: silvery looking precious metal whose atoms are arranged in closely packed hexagonal layers. First and fourth layers are in line with each other. This gives what is known as a face centred cubic pattern or cubic close packing. Platinum is extremely expensive, much more so than gold.
Image is 500 pixels across, the originals are 4096 pixels across.
(above) platinum #2 atoms arranged in a face centred cubic pattern