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"Crystal is a solid material that has a well-defined and non-diffuse diffraction pattern. Many of the natural crystals are formed by the crystallization of gases under pressure on the inner wall of geodes (rock cavity). The shape, quality, the size or color of the crystal depends on the pressure and the composition of the gases in the geodes.
Glass is often mistaken for a type of crystal, but it is not because their molecular properties are not the same. Glass is amorphous and glass is not. Crystal cannot be recycled with glass because it has lead oxide. For this reason it cannot be melted in the same furnaces as glass.
The constituents of the crystal are arranged in a highly ordered microscopic structure that forms a crystal lattice extending in all directions. The union of the particles is arranged in a regular way and follows a concrete scheme that creates a three-dimensional network.
Crystallography is the scientific study of crystals and their formation and crystallization would be the process of crystal formation.
These are the types of crystals that can be found:
Solid crystals: they are the most numerous. Except for amorphous substances and glass, solid matter is in a crystalline state. Most of the time it is in the form of aggregate of small crystals (ice, rocks ...)
Luminous crystals: they are considered liquid and are used mainly in electronic device screens. They are formed by sheets of metallized glass that surround a film of mesomorphic substance. When electrical voltage is added to the film it becomes opaque and when the voltage disappears it becomes transparent again.
Ionic crystals: they have 2 important characteristics: they are formed by charged bonds and anions and cations have different sizes. It is a hard but brittle crystal, and they have high melting points.
Covalent crystals: their atoms are linked by a three-dimensional network through covalent bonds. Diamond or quartz belong to this group.
Molecular crystals: the molecules that are joined by hydrogen bonds or van der Waals forces are located at the reticular points. They are generally packed as close together as their shape and size allow. They are usually brittle and have their melting point below 100 ° C.
Metallic crystals: they have a simple structure since in each reticular point there is an atom of the same metal. They have a cubic structure both on their body and on their face. They are dense and their properties vary depending on the metal. "