Morphological consequences of differential Mg<sup>2+</sup>incorporation at structurally distinct steps on calcite

Davis, Kevin J.; Dove, Patricia M.; Wasylenki, Laura E.; Yoreo, James J. De

doi:10.2138/am-2004-5-605

Cited by 154 publications

(171 citation statements)

References 24 publications

Supporting

Mentioning

150

Contrasting

Order By: Relevance

“…3D) to that elongated in the c-direction in the 1:2 system (Fig. 4D1, arrow)], consistent with a previous atomic force microscopy observation (48) of corner rounding at the +/− intersection sites on calcite rhombohedra attributable to the Mg 2+ effect. The SAED and EDS data collected at various locations within each sample provided additional information concerning the compositional homogeneity and Mg/Ca ordering of the obtained solids.…”

Section: Resultssupporting

confidence: 89%

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

Yan

Zhang

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

144

134

View full text Add to dashboard Cite

Dolomite and magnesite are simple anhydrous calcium and/or magnesium carbonate minerals occurring mostly at Earth surfaces. However, laboratory synthesis of neither species at ambient temperature and pressure conditions has been proven practically possible, and the lack of success was assumed to be related to the strong solvation shells of magnesium ions in aqueous media. Here, we report the synthesis of MgCO 3 and Mg x Ca (1−x) CO 3 (0 < x < 1) solid phases at ambient conditions in the absence of water. Experiments were carried out in dry organic solvent, and the results showed that, although anhydrous phases were readily precipitated in the water-free environment, the precipitates' crystallinity was highly dependent on the Mg molar percentage content in the solution. In specific, magnesian calcite dominated in low [Mg 2+ (1−x) CO 3 were formed. These findings exposed a previously unrecognized intrinsic barrier for Mg 2+ and CO 3 2− to develop long-range orders at ambient conditions and suggested that the long-held belief of cation-hydration inhibition on dolomite and magnesite mineralization needed to be reevaluated. Our study provides significant insight into the long-standing "dolomite problem" in geochemistry and mineralogy and may promote a better understanding of the fundamental chemistry in biomineralization and mineral-carbonation processes.sedimentary geology | carbon sequestration | nonaqueous solvent R arely is there a geological challenge that has endured as long a search for answers as the "dolomite problem" has. Identified more than 220 y ago by the French mineralogist Déodat de Dolomieu, the calcium magnesium carbonate mineral known as dolomite [CaMg(CO 3 ) 2 ] has since been synthesized repeatedly but exclusively at high-temperature and, in some instances, highpressure conditions (1-4). However, in many cases other than igneous-originated carbonatite and deep-burial dolomitization, the formation of dolomitic phases (e.g., microbial and cave deposits) are certainly not associated with such high-temperature and/or -pressure environments (5-8). This obvious discrepancy, compounded by the sharp contrast of massive ancient dolomite formations to the scarcity of modern observations, prompted an arduous search for answers for the past two centuries and, because of a lack of success, has been referred to as the dolomite problem (6, 9-16). Our inability to form dolomite at ambient conditions is hardly the only challenge in mineralogy; a similar situation exists in the case of pure magnesium carbonate [magnesite (MgCO 3 )], which has posed the same level of difficulty to nucleate and grow at room temperature and atmospheric pressure in laboratories but frequently occurs in natural sedimentary settings at earth (sub)surfaces. Interestingly, both dolomite and magnesite belong to the mineral class of anhydrous carbonates. Thus, it becomes logical to surmise that the dolomite problem and the magnesite problem probably share the same root, that is, the difficulty to incorporate unhydrated magnesium ions i...

show abstract

Section: Resultssupporting

confidence: 89%

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

Yan

Zhang

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

144

134

View full text Add to dashboard Cite

show abstract

“…TEM images (Fig. xx to yy) suggested that the crystals formed in the 1:1 and 1:2 solutions becomes significantly elongated relative to those (almost perfectly euhedral) seen in the 1:5 samples, agreeing well with previously observed Mg 2+ effect on calcite morphology in AFM study 12 . Selected Area Diffraction (SAED) pattern showed the presence of both amorphous and crystalline phases in the 1:1 solutions (Fig.…”

Section: Resultssupporting

confidence: 89%

Interface Induced Carbonate Mineralization: A Fundamental Geochemical Process Relevant to Carbon Sequestration

Xu¹,

Zhou²,

Zhang³

et al. 2013

View full text Add to dashboard Cite

“…DNA strands were synthesized by conventional phosphoramidite procedures 15 and were purified by denaturing polyacrylamide gel electrophoresis, extracted with butanol, and desalted by ethanol precipitation. Dinucleoside phosphates were HPLC purified on a NovaPak HR C 18 prep column using acetonitrile and 0.1 M triethylamine acetate (pH 7.0) as eluants. Stoichiometric mixtures of the strands (estimated by OD 260 ) were prepared to appropriate concentrations in a solution containing 40 mM Tris-HCl, pH 8.0, 20 mM acetic acid, 0.1 mM EDTA, and 125 mM calcium chloride.…”

Section: Methodsmentioning

confidence: 99%

Morphology Change of Calcium Carbonate in the Presence of Polynucleotides

Lukeman

Stevenson

Seeman

2008

Crystal Growth & Design

View full text Add to dashboard Cite

Two-dimensional DNA lattices are grown under conditions that also are suitable for the magnesium-free growth of three-dimensional calcium carbonate crystals. These lattices are used to template morphology changes in calcium carbonate. The effects of DNA lattices, sub-assemblies, duplexes, single strands, dinucleotides, and mononucleotides on calcium carbonate morphology are studied. A "rotated" morphology of calcite is found to predominate when a critical concentration of any polynucleotide is reached in the templating solution.

show abstract

Morphological consequences of differential Mg²⁺incorporation at structurally distinct steps on calcite

Cited by 154 publications

References 24 publications

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

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

Interface Induced Carbonate Mineralization: A Fundamental Geochemical Process Relevant to Carbon Sequestration

Morphology Change of Calcium Carbonate in the Presence of Polynucleotides

Contact Info

Product

Resources

About

Morphological consequences of differential Mg2+incorporation at structurally distinct steps on calcite

Cited by 154 publications

References 24 publications

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

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

Interface Induced Carbonate Mineralization: A Fundamental Geochemical Process Relevant to Carbon Sequestration

Morphology Change of Calcium Carbonate in the Presence of Polynucleotides

Contact Info

Product

Resources

About

Morphological consequences of differential Mg²⁺incorporation at structurally distinct steps on calcite

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

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