Crystal - Wikipedia
https://en.wikipedia.org/wiki/Crystal
OverviewCrystal structure (microscopic)Crystal faces and shapesOccurrence in naturePolymorphism and allotropyCrystallizationDefects, impurities, and twinningChemical bondsA crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macroscopic single crystals are usually identifiable by their geometrical shape, consisting of flat faces with specific, characteristic orientations. The scientific study of crysta…
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