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Media in category "Tetragonal minerals" This category contains only the following file. Cassiterite.jpg 5,616 × 3,744; 4.17 MB
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.
Chemical elements with body-centered tetragonal structure (3 P) M. Tetragonal minerals (34 C, 119 P, 1 F) S. Tetragonal crystal system (3 C, 1 P)
Optical properties of common minerals Name Crystal system Indicatrix Optical sign Birefringence Color in plain polars Anorthite: Triclinic: Biaxial (-) 0.013
Chemical elements with body-centered tetragonal structure (3 P) M. Tetragonal minerals (34 C, 119 P, 1 F) T. Tetragonal crystals (3 C, 2 P)
Tetragonal orthogonal Inverse tetragonal orthogonal 12 5 7 1 Tetragonal orthogonal KG 351 5 Tetragonal orthogonal P, S, I, Z, G Proper tetragonal orthogonal 13 10 1312 XI Hexagonal orthogonal Trigonal orthogonal 14 10 81 2 Hexagonal orthogonal R, RS 150 2 Hexagonal orthogonal P, S Hexagonal orthogonal 15 12 240 XII Ditetragonal monoclinic* 16
See also External links A Abelsonite: C 31 H 32 N 4 Ni – American physicist Philip Hauge Abelson (1913–2004) Abswurmbachite: Cu 2+ Mn 3+ 6 O 8 SiO 4 – German mineralogist Irmgard Abs-Wurmbach (1938–2020) Adamite: Zn 2 AsO 4 OH – French mineralogist Gilbert Joseph Adam (1795–1881) Agrellite: NaCa 2 Si 4 O 10 F – English optical mineralogist Stuart Olof Agrell (1913–1996 ...
It belongs to the spinel group and forms tetragonal crystals. Hausmannite is a brown to black metallic mineral with Mohs hardness of 5.5 and a specific gravity of 4.8. The type locality is Oehrenstock (Öhrenstock), Ilmenau, Thuringian Forest, Thuringia, Germany, where it was first described in 1813. [3]