There is no formula for that. It can be any height. The fact that it is hexagonal has nothing to do with it.
A hexagon is a 2-dimensional shape. A "structure" implies a 3-dimensional shape but you have not specified whether it is a hexagonal pyramid, a hexagonal prism or some other shape that is [partly] based on a hexagon. Without that information it is not possible to give a more helpful answer.
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.
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.
Corundum ( (Al_2O_3) ) is hexagonal in crystal structure.
hexagonal
Beryllium's crystal structure is hexagonal.
Dolomite has a trigonal crystal structure which in turn has a hexagonal lattice structure.
Technetium has a hexagonal crystalline structure.
Hexagonal. Trigonal Crystal System.
Yes, the crystalline structure of zinc is hexagonal.
There is no formula for that. It can be any height. The fact that it is hexagonal has nothing to do with it.
Curium has a double hexagonal close packed crystalline structure.
Magnesium's crystal structure is hexagonal.
The crystalline structure of titanium is hexagonal.
The crystalline structure of sodium chloride is face centered cubic.The crystalline structure of water is hexagonal.