wulfenite
Examples:- density: 4,74 g/cm3- melting point: 446 oC- crystal structure: tetragonal
== == A tetragonal has four sides.
A tetragonal prism is a cuboid and so has 6 faces.
A tetragonal is square shaped whereas a tetrahedron is a triangular based pyramid.
The main difference between a tetragonal crystal and a cubic crystal lies in their unit cell structure. In a tetragonal crystal, the unit cell has one axis longer or shorter than the other two perpendicular axes, resulting in a rectangular prism shape. In a cubic crystal, all three axes are of equal length, forming a cube-shaped unit cell.
A tetragonal lattice does exist in crystallography, characterized by two equal lattice parameters in the plane perpendicular to the principal axis. However, it is not as common as other crystal systems like cubic or hexagonal due to its symmetry properties. When tetragonal crystals do form, they often undergo phase transitions to more stable structures like cubic.
The tetragonal space group of the crystal structure being studied is P4/mmm.
tetragonal pyramidal
Simple reason - It violates the cubic symmetry. To see it from another perspective - Base centered cubic lattice is equivalent to a simple tetragonal lattice. Draw two unit cells adjacent to each other. Then connect the base center points to the corener points which are shared by these two unit cells. Then connect the two base centered point in each unit cell. Now you have a simple tetragonal lattice. Simple tetragonal lattice has one lattice point per unit cell compared to two lattice point per unit cell of base centered lattice. Always the lower lattice point lattice is considered for a given symmetry. Because of symmetry breaking, the symmetry of base centered cubic lattice is same as tetragonal lattice.
Tetragonal hybridization is a type of hybridization in which one s and three p atomic orbitals mix to form four sp^3 orbitals oriented in a tetragonal arrangement. This hybridization occurs in molecules or ions with a central atom surrounded by four regions of electron density.
An abswurmbachite is a tetragonal copper manganese silicate mineral.
A face-centered tetragonal crystal structure has unique characteristics such as having a rectangular base with additional atoms at the center of each face. This structure is similar to a simple tetragonal structure but with additional atoms at the face centers, giving it a more symmetrical shape.