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Crystals are solid material whose constituents, such as atoms, molecules or ions, are *arranged in a highly ordered microscopic pattern*, a crystal lattice that extends with regularity in all directions. Use for all crystallography and ordered structure topics.

Crystals are solid material whose constituents, such as atoms, molecules or ions, are arranged in a highly ordered microscopic pattern, a crystal lattice that extends with regularity in all directions. Macroscopic single crystals are usually identifiable by their characteristic geometrical shape, consisting of flat faces with specific orientations.

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