The hcp exhibit the space group P6(3)/mmc and can be discripted as dihexagonal dipyramidal. The hexagonal crystal structure (a = b and alpha = beta = 90°, gamma = 120°) includes 27 space groups and one of them is P6(3)/mmc.

The hcp exhibit the space group P6(3)/mmc and can be discripted as dihexagonal dipyramidal. The hexagonal crystal structure (a = b and alpha = beta = 90°, gamma = 120°) includes 27 space groups and one of them is P6(3)/mmc.

So how to identify and differentiate them? F.e. By indexing of a diffraction pattern (x-ray)

Thanks for help Ralph. I was a little confused with both of them. thats why my Omega phase (hexagonal) SAEDP are slightly different than zirconium (HCP) :)