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  1. 1 giorno fa · 1923 - Roscoe Dickinson and Albert Raymond, and independently, H.J. Gonell and Hermann Mark, first showed that an organic molecule, specifically hexamethylenetetramine, could be characterized by x-ray crystallography. [64] [65] 1923 - William H. Bragg and Reginald E. Gibbs elucidated the structure of quartz.