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  2. Crystal - Wikipedia

    en.wikipedia.org/wiki/Crystal

    Crystals are commonly recognized, macroscopically, by their shape, consisting of flat faces with sharp angles. These shape characteristics are not necessary for a crystal—a crystal is scientifically defined by its microscopic atomic arrangement, not its macroscopic shape—but the characteristic macroscopic shape is often present and easy to see.

  3. Crystal structure - Wikipedia

    en.wikipedia.org/wiki/Crystal_structure

    Crystal structure of table salt (sodium in purple, chlorine in green). In crystallography, crystal structure is a description of ordered arrangement of atoms, ions, or molecules in a crystalline material. [1]

  4. Lead glass - Wikipedia

    en.wikipedia.org/wiki/Lead_glass

    Lead glass, commonly called crystal, is a variety of glass in which lead replaces the calcium content of a typical potash glass. [1] Lead glass contains typically 18–40% (by mass) lead(II) oxide (PbO), while modern lead crystal , historically also known as flint glass due to the original silica source, contains a minimum of 24% PbO. [ 2 ]

  5. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    The first crystals were found in a pegmatite found near Rumford, Maine, US, and in Minas Gerais, Brazil. [47] The crystals found are more transparent and euhedral, due to the impurities of phosphate and aluminium that formed crystalline rose quartz, unlike the iron and microscopic dumortierite fibers that formed rose quartz. [48]

  6. Crystal system - Wikipedia

    en.wikipedia.org/wiki/Crystal_system

    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).

  7. Liquid crystal - Wikipedia

    en.wikipedia.org/wiki/Liquid_crystal

    Liquid crystal (LC) is a state of ... The magnitude of the fields, as well as the speed at which the molecules align are important characteristics industry deals with ...

  8. Crystal habit - Wikipedia

    en.wikipedia.org/wiki/Crystal_habit

    In mineralogy, crystal habit is the characteristic external shape of an individual crystal or aggregate of crystals. The habit of a crystal is dependent on its crystallographic form and growth conditions, which generally creates irregularities due to limited space in the crystallizing medium (commonly in rocks ).

  9. Crystallography - Wikipedia

    en.wikipedia.org/wiki/Crystallography

    Crystallography ranges from the fundamentals of crystal structure to the mathematics of crystal geometry, including those that are not periodic or quasicrystals. At the atomic scale it can involve the use of X-ray diffraction to produce experimental data that the tools of X-ray crystallography can convert into detailed positions of atoms, and ...

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