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An example of the tetragonal crystals, wulfenite Two different views (top down and from the side) of the unit cell of tP30-CrFe (σ-phase Frank–Kasper structure) that show its different side lengths, making this structure a member of the tetragonal crystal system. In crystallography, the tetragonal crystal system is one of the 7 crystal systems.
Media in category "Tetragonal minerals" This category contains only the following file. Cassiterite.jpg 5,616 × 3,744; 4.17 MB
Crystal system Indicatrix Optical sign Birefringence Color in plain polars ... Tetragonal (pseudoisometric) Uniaxial (-) 0.003: None Enstatite: Orthorhombic: Biaxial (+)
Tetragonal crystal system (3 C, 1 P) Pages in category "Tetragonal crystals" The following 2 pages are in this category, out of 2 total.
Crystal systems that have space groups assigned to a common lattice system are combined into a crystal family. The seven crystal systems are triclinic, monoclinic, orthorhombic, tetragonal, trigonal, hexagonal, and cubic. Informally, two crystals are in the same crystal system if they have similar symmetries (though there are many exceptions).
It crystallizes in the tetragonal system, in the form of square tabular crystals, and with distinct cleavage on {011}. It crystals also display transparency and adamantine luster. The X-ray diffraction data, calculated cell dimensions, constants and optic axial angles of the synthetic wulfenite are consistent with those of the natural mineral.
The steeper angle gives anatase crystals a longer vertical axis and skinnier appearance than rutile. Additional important differences exist between the physical characters of anatase and rutile. For example, anatase is less hard (5.5–6 vs. 6–6.5 on the Mohs scale) and less dense (specific gravity about 3.9 vs. 4.2
Tetragonal: I4/mmm (No. 139) 2: Identical symmetry to the In type structure. Can be considered slightly distorted from an ideal W type body centered cubic structure which has / =. β-Sn: A5: Tetragonal: I4 1 /amd (No. 141) 4: 4 neighbours at 302 pm; 2 at 318 pm; 4 at 377 pm; 8 at 441 pm [18] white tin form (thermodynamical stable above 286.4 K)