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  1. Hace 7 horas · 1912 - Heinrich Baumhauer discovered and described polytypism in crystals of carborundum, or silicon carbide. [50] 1913 - Lawrence Bragg published the first observation of x-ray diffraction by crystals. [51] 1913 - Georges Friedel stated Friedel's law, a property of Fourier transforms of real functions.