The least tightly packed crystal structure.
Crystalline allotrope of elemental carbon, the hardest known natural substance.
The face-centred cubic metal lattice allows the closest fit of metal atoms.
One of the crystalline allotropes of elemental carbon.
Metals forming hexagonal metallic lattices are rigid and difficult to machine.
This animation demonstrates the five regular three-dimensional (or Platonic) solids, the best known of which is the cube.
This animation demonstrates various groups of solids through examples.
A crystalline substance, an extremely important material in the electronics industry (semiconductors, integrated circuits).
A polymorphic compound, mostly found in the form of quartz.