A crystal It is a homogeneous portion of matter with an ordered and defined atomic structure and with an external shape limited by flat and uniform, symmetrically arranged surfaces.
Crystals are produced when a liquid slowly forms a solid, for example, the freezing of a liquid, the deposit of dissolved matter or the direct condensation of a gas into a solid.
The angles between the equivalent faces of two crystals of the same matter are always identical, regardless of the size or differences in shape of their surface.
The crystals are grouped into six symmetry systems: cubic or isometric, hexagonal, tetragonal, orthorhombic, monoclinic and triclinic.
Most of the solid matter has its atoms arranged in an orderly manner and, therefore, has a crystalline structure. Solids without crystalline structure are called amorphous.
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