Why some rocks can lock away CO₂ within hours: the chemistry behind faster mineralization

THE STORY

Carbon dioxide can become part of a stable solid when it reacts with suitable rocks. Yet some minerals transform in hours while others change far more slowly. A paper published in Nature Communications on 14 October 2026 gives an atomic-scale explanation for this striking difference between calcium-bearing and magnesium-rich olivines. The advance is not that mineral carbonation has suddenly been invented, but that researchers can better predict why one surface reacts so much faster.

Olivine refers to a family of silicate minerals found in rocks, including magnesium-rich formations. As carbon dioxide interacts with a suitable surface, chemical reactions can facilitate ion release from the solid and ultimately carbonate formation. Simply naming the metal ion, however, does not fully explain the reaction-rate contrast. Calcium and magnesium also influence how reactive the oxygen atoms at the surface become.

The team used first-principles molecular calculations to identify nonbridging oxygen sites as crucial partners in CO₂ surface reactions. For calcium-bearing olivine, the model found that carbonation lowered the calculated barrier to calcium ion dissolution by 60%. The resulting predicted ion-release rate rose by six orders of magnitude, roughly a millionfold, relative to the studied reference condition. That figure describes a specific calculated chemical comparison, not a universal claim about how fast any rock can store carbon.

Researchers then used their results to calculate apparent reaction-rate constants and compared them with experimental evidence. The calculations reproduced the reported complete conversion of calcium olivine within hours under carbon dioxide at one atmosphere in laboratory conditions. Connecting atomic mechanisms with macroscopic experimental behavior is valuable. It is not evidence that a natural underground formation was mineralized within hours.

Moving beyond the laboratory requires answering a different set of questions: where suitable material can be obtained, how CO₂ and water are transported into it, how much energy processing consumes and whether products remain stable. Natural rocks also contain impurities and fractured structures that can change chemistry. The new work offers a more predictive foundation for carbon mineralization, but its climate value depends on real-material tests and a whole-process emissions balance.