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Johann Friedrich Christian Hessel (27 April 1796 - 3 June 1872) was a German physician (MD, University of Würzburg, 1817) and professor of mineralogy (PhD, University of Heidelberg, 1821) at the University of Marburg.

Contributions to Mineralogy and Crystallography

The origins of geometric crystallography (the field concerned with the structures of crystalline solids), for which Hessel's work was noteworthy, can be traced back to eighteenth

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