| Zircon commonly forms curved tetragonal crystals that radiate from a base of biotite crystals and terminate in adjacent feldspar. |
| The crystals are stepped tetragonal pyramids associated with chrysocolla. |
| The zircon, hyacinth, jacinth, or jargoon belong to the tetragonal system of crystallization. |
| Rutile is a tetragonal mineral famous for its variety of crystal habits and twinning. |
| Small, black, tetragonal anatase crystals associated with rutile were found on microcline by Kile. |
| RyRs are disposed in a tetragonal arrangement, and groups of four DHPRs, or tetrads, are associated with alternate RyRs, forming a related array. |
