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Minerals 2018, 8(1), 17; https://doi.org/10.3390/min8010017

Effect of Mica and Hematite (001) Surfaces on the Precipitation of Calcite

1
NASA Astrobiology Institute, Department of Geoscience, University of Wisconsin—Madison, Madison, WI 53706, USA
2
Department of Chemistry, The George Washington University, Washington, DC 20052, USA
*
Author to whom correspondence should be addressed.
Received: 17 November 2017 / Revised: 31 December 2017 / Accepted: 9 January 2018 / Published: 12 January 2018
(This article belongs to the Special Issue Fundamentals and Frontiers in Mineralogy)
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Abstract

The substrate effect of mica and hematite on the nucleation and crystallization of calcite was investigated using scanning electron microscope (SEM), X-ray diffraction (XRD), and electron backscatter diffraction (EBSD) methods. On mica, we found, in the absence of Mg2+, the substrates’ (001) surfaces with hexagonal and pseudo-hexagonal two-dimensional (2-D) structure can affect the orientation of calcite nucleation with calcite (001) ~// mica (001) and calcite (010) ~// mica (010) to be the major interfacial relationship. On hematite, we did not observe frequent twinning relationship between adjacent calcite gains, but often saw preferentially nucleation of calcite at surface steps on hematite substrate. We suggest that calcite crystals initially nucleate from the Ca2+ layers adsorbed on the surfaces. The pseudo-hexagonal symmetry on mica (001) surface also leads to the observed calcite (001) twinning. A second and less common orientation between calcite {104} and mica (001) was detected but could be due to local structure damage of the mica surface. Results in the presence of Mg2+ show that the substrate surfaces can weaken Mg toxicity to calcite nucleation and lead to a higher level of Mg incorporation into calcite lattice. View Full-Text
Keywords: calcite; high-magnesian calcite; mica; hematite; clay minerals; clay minerals; substrate effect; heterogeneous nucleation; twinning; EBSD calcite; high-magnesian calcite; mica; hematite; clay minerals; clay minerals; substrate effect; heterogeneous nucleation; twinning; EBSD
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Xu, H.; Zhou, M.; Fang, Y.; Teng, H.H. Effect of Mica and Hematite (001) Surfaces on the Precipitation of Calcite. Minerals 2018, 8, 17.

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