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

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 Mg 2+, 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 Ca 2+ 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 Mg 2+ show that the substrate surfaces can weaken Mg toxicity to calcite nucleation and lead to a higher level of Mg incorporation into calcite lattice.

Authors:
 [1];  [1];  [1];  [2]
  1. Univ. of Wisconsin, Madison, WI (United States). NASA Astrobiology Inst. Dept. of Geoscience
  2. George Washington Univ., Washington, DC (United States). Dept. of Chemistry
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); National Aeronautic and Space Administration (NASA)
OSTI Identifier:
1505152
Grant/Contract Number:  
SC0001929; FG02-09ER16050; NNA13AA94A
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Minerals
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2075-163X
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 36 MATERIALS SCIENCE; calcite; high-magnesian calcite; mica; hematite; clay minerals; substrate effect; heterogeneous nucleation; twinning; EBSD

Citation Formats

Xu, Huifang, Zhou, Mo, Fang, Yihang, and Teng, H. Effect of Mica and Hematite (001) Surfaces on the Precipitation of Calcite. United States: N. p., 2018. Web. doi:10.3390/min8010017.
Xu, Huifang, Zhou, Mo, Fang, Yihang, & Teng, H. Effect of Mica and Hematite (001) Surfaces on the Precipitation of Calcite. United States. doi:10.3390/min8010017.
Xu, Huifang, Zhou, Mo, Fang, Yihang, and Teng, H. Fri . "Effect of Mica and Hematite (001) Surfaces on the Precipitation of Calcite". United States. doi:10.3390/min8010017. https://www.osti.gov/servlets/purl/1505152.
@article{osti_1505152,
title = {Effect of Mica and Hematite (001) Surfaces on the Precipitation of Calcite},
author = {Xu, Huifang and Zhou, Mo and Fang, Yihang and Teng, H.},
abstractNote = {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.},
doi = {10.3390/min8010017},
journal = {Minerals},
issn = {2075-163X},
number = 1,
volume = 8,
place = {United States},
year = {2018},
month = {1}
}

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Works referenced in this record:

The role of magnesium in the crystal growth of calcite and aragonite from sea water
journal, April 1975


Formation of High-Magnesian Calcites via an Amorphous Precursor Phase: Possible Biological Implications
journal, January 2000