Cited by 181Calcium Carbonate Crystallization and InhibitionCO2 Sequestration and Geologic InteractionsCrystallization and Solubility Studies

Testing the cation-hydration effect on the crystallization of Ca–Mg–CO 3 systems

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Xu, Jie, Yan, Chao, Zhang, Fangfu, Konishi, Hiromi, Xu, Huifang, Teng, H. Henry·2013·Proceedings of the National Academy of Sciences

Abstract

Significance: Magnesium-bearing carbonate minerals play critical roles in the health and function of the Earth system because they constitute a significant fraction of lithosphere carbon reservoir and build skeletal structures for the majority of marine invertebrate organisms. Despite wide occurrence, high-Mg and sole-Mg phases such as dolomite ([Ca,Mg]CO 3 ) and magnesite (MgCO 3 ) prove virtually impossible to be crystallized under ambient conditions. It has long been believed that Mg 2+ hydration is the cause for such a geological mystery. Here, we probe this hypothesis by investigating Ca–Mg–CO 3 precipitation in the absence of water and find direct proof suggesting the existence of a more intrinsic crystallization barrier. These findings provide a perspective augmenting our understanding in carbonate mineralogy, biomineralization, and mineral-carbonation processes.

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Crossref · 10.1073/pnas.1307612110

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  • The dehydration of the Mg-water complex is considered the most critical barrier for dolomite nucleation and growth.

    “Therefore, the dehydration of the Mg–water complex is considered the most critical barrier for dolomite nucleation and growth.21,27,32”

    From Low-Temperature Synthesis of Disordered Dolomite and High-Magnesium Calcite in Ethanol–Water Solutions: The Solvation Effect and Implications (2022) · cites this paper as [32]

    The Aqueous-phase reactions section describes Mg hydration as a long-standing explanation for difficulty forming dolomite, but the paper tests that explanation rather than endorsing it as the most critical barrier. The Conclusion (page not available) reports a fundamental barrier other than cation hydration that prevents ordered Mg-carbonate structures from forming, while acknowledging a hydration effect. (LLM, conf=0.88)

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  • Anhydrous amorphous Mg carbonates have been formed in aprotic solvents.

    “but anhydrous amorphous Mg carbonates have been formed in aprotic solvents.17”

    From Mechanisms of Mg carbonates precipitation and implications for CO <sub>2</sub> capture and utilization/storage (2023) · cites this paper as [17]

    The Results and Discussion report producing anhydrous amorphous magnesium carbonate. The paper says the experiments used dry formamide, described in the introduction as a hydrogen-bonding organic solvent (O=CH–NH₂); it does not support describing the solvent as aprotic. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • The hydration problem is not the only limiting factor in inhibiting dolomite growth in a low-temperature environment; other factors are lattice limitation, difference in cation properties, and reduced surface energy from cation disordering.

    “We recognize that the hydration problem is not the only limiting factor in inhibiting dolomite growth in a low-temperature environment. Other factors are lattice limitation,32 difference in cation properties,39 and reduced surface energy from cation disordering.40”
  • A significantly slower water-exchange rate of Mg2+ compared to that of Ca2+ resulted in a more stable hydration shell around Mg2+.

    “On the other hand, a significantly slower water-exchange rate of Mg2+ compared to that of Ca2+ resulted in a more stable hydration shell around Mg2+.32”
  • Few works in the last decade have demonstrated precipitation of amorphous magnesium carbonates employing variable precursors (MgCl2•6H2O, MgO, and anhydrous MgCl2).

    “As a matter of fact, few works produced in the last decade have demonstrated the precipitation of amorphous magnesium carbonates employing variable precursors (MgCl 2 •6H 2 O, 85 MgO, 86,87 and anhydrous MgCl 2 17,88 ).”

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Research works printed but not linked: 1

  1. [27]27. Zhao L, Sang L, Chen J, Ji J, Teng HH (2010) Aqueous carbonation of natural brucite: Relevance to CO2 sequestration. Environ Sci Technol 44(1):406-411.

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Authors
Xu, J., Yan, C., Zhang, F., Konishi, H., Xu, H., & Teng, H. H.
Affiliations
  • George Washington University (US)
  • University of Wisconsin–Madison (US)
Venue
Proceedings of the National Academy of Sciences
Published
2013-10-14
Volume
110
Issue
44
Pages
17750-17755
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W1998776045
Cited by
181
References
77
Citations by year
2026: 27 · 2025: 11 · 2024: 14 · 2023: 14 · 2022: 15 · 2021: 18 · 2020: 10 · 2019: 17 · 2018: 13 · 2017: 10 · 2016: 13 · 2015: 12 · 2014: 7
FWCI
4.07
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
U.S. Department of Energy (DE‐FG02‐, FG02-02ER15366, DEFG0202ER15366)
Topics
  • Physical Sciences › Materials Science › Biomaterials › Calcium Carbonate Crystallization and Inhibition
  • Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
  • Physical Sciences › Materials Science › Materials Chemistry › Crystallization and Solubility Studies
Keywords
dolomite problem, magnesite, dolomite, magnesian calcite, amorphous carbonates, protodolomite, nanocrystals, calcium carbonate, biomineralization, CO2 mineralization
MeSH terms
Calcium Carbonate, Crystallization, Image Processing, Computer-Assisted, Magnesium, Microscopy, Electron, Scanning, Chemical Precipitation, Spectrophotometry, Infrared, Water, X-Ray Diffraction, Microscopy, Electron, Transmission

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