| In this case, the c-axis, or axis of trigonal symmetry, is vertical with respect to the organic substrate and hence to the wall itself. |
| These are, in order of decreasing symmetry, the cubic, hexagonal, tetragonal, trigonal, orthorhombic, monoclinic, and triclinic systems. |
| Pezzottaite is trigonal, whereas the other members of the beryl group are hexagonal. |
| Rhodochrosite crystallizes in the trigonal class of the hexagonal system and occurs in a number of diverse forms. |
| The horns are trigonal, laterally compressed and knotted on the upper edge. |
| The models explain the trigonal pyramidal shape of fibroblast growth factor and provide a basis for interpretation of protein crystal structures. |
