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Home » Dolomite mystery solved: Scientists finally grow common mineral in lab

Dolomite mystery solved: Scientists finally grow common mineral in lab

Over the span of two centuries, scientists grappled with a formidable challenge: the inability to reproduce a common mineral in laboratory settings that mirrored its natural formation conditions. This scientific enigma, known as the “Dolomite Problem,” has recently been unravelled by a team of researchers hailing from the University of Michigan and Hokkaido University in Sapporo, Japan. Their groundbreaking success, driven by a novel theory derived from atomic simulations, sheds light on the persistent mystery surrounding dolomite—a crucial mineral found in iconic locations like the Dolomite mountains in Italy, Niagara Falls, the White Cliffs of Dover, and Utah's Hoodoos.

Dolomite's peculiar behavior lies in its abundance in rocks older than 100 million years, sharply contrasting with its scarcity in younger formations. The key to replicating dolomite in a lab setting, according to the researchers, lay in a meticulous understanding of its growth process and the elimination of defects in its mineral structure. Dolomite's growth edge, unlike other minerals, consists of alternating rows of calcium and magnesium. In water, where minerals typically form, calcium and magnesium randomly attach to the growing dolomite crystal, creating defects that impede further growth. This disorder slows down dolomite growth to a near standstill, requiring an estimated 10 million years to form just one layer of ordered dolomite.

However, the breakthrough discovery was rooted in the understanding that these defects are not permanent. As the disordered atoms are less stable than those in the correct position, they dissolve when the mineral is washed with water. The repeated rinsing away of these defects, through natural processes like rain or tidal cycles, enables the relatively rapid formation of dolomite layers over geological time. This insight into dolomite growth, achieved through atomic simulations, finally cracked the Dolomite Problem that had confounded scientists for two centuries.

Credit: University of Michigan

Accurate simulation of dolomite growth over geological timescales required advanced calculations of the energy involved in every single interaction between electrons and atoms in the growing crystal. The researchers employed software developed at U-M's Predictive Structure (PRISMS) Center, which offered a shortcut in these complex calculations. This innovative approach significantly reduced the power needed, making it feasible to simulate dolomite growth with unprecedented efficiency.

The implications of this breakthrough extend beyond the realm of geology. The researchers assert that understanding how dolomite grows in nature could inspire new strategies for promoting the crystal growth of modern technological materials. The lessons learned from the Dolomite Problem have direct applications for engineers working on semiconductors, solar panels, batteries, and other technologies. The conventional wisdom of growing materials slowly to minimize defects is challenged by the newfound understanding that defect-free materials can be grown rapidly by periodically dissolving defects during the growth process.

In conclusion, the successful replication of dolomite in laboratory conditions not only resolves a longstanding geological mystery but also provides valuable insights with broad implications for materials science and technology. This breakthrough underscores the importance of interdisciplinary research, atomic simulations, and innovative approaches in unraveling complex scientific puzzles that have persisted for centuries.

Source: University of Michigan

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