A failed diplomat became the father of catalysis and the master of crystals

Nature · Published 3 October 2026 Swipe more like this →

In short: Eilhard Mitscherlich intended to study Persian and join a diplomatic mission to the East, but a political collapse changed his path. Instead, he became a titan of 19th-century chemistry, discovering how crystals change shape and identifying the mysterious process that accelerates reactions without being consumed itself.

Born in 1794, Eilhard Mitscherlich initially pursued philology and Persian studies. However, the 1814 abdication of Napoleon Bonaparte derailed his plans to join a diplomatic embassy. Seeking a way to travel freely as a physician, he pivoted to medicine and chemistry at the University of Göttingen. This shift proved transformative; his fascination with chemical composition soon eclipsed his original ambitions.

In 1819, Mitscherlich published his groundbreaking theory of isomorphism, noting that phosphates and arsenates with similar compositions crystallize into identical forms. His work caught the attention of Jöns Jakob Berzelius, leading to a prestigious research stint in Stockholm. By 1825, Mitscherlich had expanded his inquiry into polymorphism, demonstrating that minerals like calcite and aragonite share the same chemical makeup despite having different crystalline structures. He further discovered that heat causes crystals to expand unevenly along dissimilar axes, a finding that deepened the scientific understanding of mineralogy.

Beyond crystallography, Mitscherlich made a vital contribution to chemical theory in the 1830s. While investigating how sulfuric acid facilitates the creation of diethyl ether from ethanol, he observed that the acid remained unchanged at the end of the process. This observation prompted Berzelius to coin the term 'catalysis' to describe reactions enabled by substances that are not consumed. Though he later turned his attention to organic chemistry and volcanic geology, his legacy remains anchored in these fundamental insights into the nature of matter.

Mitscherlich’s career was marked by academic prestige, including a professorship at the University of Berlin and honorary memberships in major scientific societies. He authored approximately 76 papers and a monumental chemistry textbook. By the time of his death in 1863, he had fundamentally reshaped the landscape of physical chemistry, leaving behind a body of work that bridged the gap between inorganic structure and organic synthesis.

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