Minerals identify

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In crystallography , the hexagonal crystal family is one of the six crystal families , which includes two crystal systems (hexagonal and trigonal) and two lattice systems (hexagonal and rhombohedral).

The hexagonal crystal family consists of the 12 point groups such that at least one of their space groups has the hexagonal lattice as underlying lattice, and is the union of the hexagonal crystal system and the trigonal crystal system. There are 52 space groups associated with it, which are exactly those whose Bravais lattice is either hexagonal or rhombohedral.


Crystal ( diaphaneity )