| The second morphotype which comprises all illustrated paratypes, bears an outer cyst surface with trigonal pointed crystal tips. |
| The models explain the trigonal pyramidal shape of fibroblast growth factor and provide a basis for interpretation of protein crystal structures. |
| The triangular habit suggested trigonal symmetry and a possible identification as hilairite or a contact-twinned form of gaidonnayite. |
| The horns are trigonal, laterally compressed and knotted on the upper edge. |
| The auricles in early ontogeny are relatively large and distinctly trigonal, with their free margins meeting the hinge line at acute angles. |
| Rhodochrosite crystallizes in the trigonal class of the hexagonal system and occurs in a number of diverse forms. |
