Amorphous solids lack regular patterns, like glass, whereas crystalline solids have a regular, repeating structure.
Amorphous solids are solids that lack long-term structure or repetition, such as glass and many plastics. On the other hand, crystalline solids exhibit a regular, repeating three-dimensional structure like NaCl crystals. An example of an amorphous solid is glass, which breaks with no regular patterns, in contrast to the ordered structure of crystalline solids.
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