![]() They exhibit symmetries, such as fivefold symmetry, that are forbidden in ordinary crystals. Quasicrystalline solids display novel symmetries in which the atoms are arranged in quasiperiodic fashion-i.e., in patterns that do not repeat at regular intervals. They include glasses, plastics, and gels. ![]() Noncrystalline solids are those in which atoms and molecules are not organized in a definite lattice pattern. Practically all metals and many other minerals, such as common table salt (sodium chloride), belong to this class. Crystalline solids have a very high degree of order in a periodic atomic arrangement. Solids are generally divided into three broad classes- crystalline, noncrystalline ( amorphous), and quasicrystalline. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!. ![]() Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century. ![]()
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