I'd be thankful if someone explains why amorphous substances are said to be isotropic and crystalline substances anisotropic

  • $\begingroup$ Not a bad question, but if you can clarify a little bit (narrow the scope), it will help you get a better answer. For example, some crystalline solids are isotropic. And there are probably corner cases (in any event) in which the statements don't apply in re: one or the other being isotropic or anisotropic. $\endgroup$ Oct 4, 2015 at 16:14
  • 1
    $\begingroup$ Related: How can diamond have a fixed refractive index? $\endgroup$
    – user7951
    Oct 4, 2015 at 18:42


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