Category:Crystals in space group 180 or 181

This is a non-diffusing subcategory of Category:Hexagonal crystals. It includes crystals that can also be found in the parent category, or in diffusing subcategories of the parent.

This category lists crystals that display the symmetry of the P6₂21 space group (No. 180) of the hexagonal crystal system, or the enantiomorphic space group P6₄21 (No. 181). The element or compound can assume either one of these two space groups.

The crystal being referred to may be just one of the possible forms of a named element or compound.