In the tetragonal system there are three axes at right angles to each other.
Pligot obtained it as minute tetragonal octahedra and cubes by reducing ferrous chloride in hydrogen.
It crystallises in the 3rd (tetragonal) system, with indistinct cleavage.
Optically uniaxial crystals—corresponding with the tetragonal and hexagonal systems.
tetragonal scalenohedron or ditetragonal bisphenoid (fig. 51).
Meshes subregular, pentagonal, intermingled with a small number of tetragonal and hexagonal meshes.
It consists of tin dioxide, or stannic oxide (SnO2), and crystallizes in the tetragonal system.
Though closely resembling the tetragonal torbernite in form, it crystallizes in the orthorhombic system and is optically biaxial.
Meshes of the network irregularly polygonal, the majority pentagonal or tetragonal.
The density and specific heat of the tetragonal form are greater than those of the yellow.
Relating to a crystal having three axes, two of which are of the same length and are at right angles to each other. The third axis is perpendicular to these. The mineral zircon has tetragonal crystals. See illustration at crystal.