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更新日期：2018-11-19
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Crystal - solid from orderly internal structure that looks like a polyhedron with natural flat facets: the orderliness of structure is to a certain frequency of crystal elements in space
Due to such a structure of crystalline substances have characteristic properties as:
began melting point
cleavage
anisotropy
elasticity
Since the crystals are composed snow and ice, rocks, sugar and so on.
Divided into the shape of symmetry. Substances that have no crystal lattice, known as amorphous substances.