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

This category lists crystals that display the P3₁21 (No. 152) space group symmetry of the trigonal crystal system, or the enantiomorphic P3₂21 (No. 154), depending on the chirality.