Another way of describing the arrangement of atoms is by identifying layers.
In the hexagonal close pack, the base layer consists of six atoms in a hexagon around a central atom.
The next layer is the same, but it is stacked above the first layer by having the atoms nestle in the spaces between atoms.
The third layer is like the first, and so on.
This structure allows the atoms to fill the available volume very effectively, much more so than the simple cubic structure. This is why very few atoms form solids with simple cubic unit cells but very many have the hexagonal close pack structure. cobalt is an example of a hexagonal close pack solid.
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Graphite is an example of a hexagonal crystal. Beryl also forms a six sided crystal.Magnesium exhibits close packed hexagonal crystal structure.
A hexagonal pyramid.A hexagonal pyramid.A hexagonal pyramid.A hexagonal pyramid.
It is not.
A hexagonal prism is a polyhedron. Many hexagonal prisms are polyhedra.
A hexagonal cylinder is an impossible object. If you meant a hexagonal prism then it is a polyhedron.