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Title: Nanoscale Transforming Mineral Phases in Fresh Nacre

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.5b07931· OSTI ID:1223142
 [1];  [1];  [2];  [1];  [3];  [4]
  1. Department of Physics, University of Wisconsin−Madison, 1150 University Avenue, Madison, Wisconsin 53706, United States
  2. Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
  3. Department of Geosciences, Princeton University, Princeton, New Jersey 08544, United States
  4. Department of Physics, University of Wisconsin−Madison, 1150 University Avenue, Madison, Wisconsin 53706, United States, Department of Chemistry, University of Wisconsin−Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States, Radcliffe Institute for Advanced Study, Harvard University, 8 Garden Street, Cambridge, Massachusetts 02138, United States

Nacre, or mother-of-pearl, the iridescent inner layer of many mollusk shells, is a biomineral lamellar composite of aragonite (CaCO3) and organic sheets. Biomineralization frequently occurs via transient amorphous precursor phases, crystallizing into the final stable biomineral. In nacre, despite extensive attempts, amorphous calcium carbonate (ACC) precursors have remained elusive. They were inferred from non-nacre-forming larval shells, or from a residue of amorphous material surrounding mature gastropod nacre tablets, and have only once been observed in bivalve nacre. Here we present the first direct observation of ACC precursors to nacre formation, obtained from the growth front of nacre in gastropod shells from red abalone (Haliotis rufescens), using synchrotron spectromicroscopy. Surprisingly, the abalone nacre data show the same ACC phases that are precursors to calcite (CaCO3) formation in sea urchin spicules, and not proto-aragonite or poorly crystalline aragonite (pAra), as expected for aragonitic nacre. In contrast, we find pAra in coral.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); US-Israel Binational Science Foundation (BSF); Harvard Univ. (United States)
Contributing Organization:
Harvard Univ., Cambridge, MA (United States); Princeton Univ., NJ (United States)
Grant/Contract Number:
FG02-07ER15899; AC02-05CH11231; DMR-1105167; BSF-2010065
OSTI ID:
1223142
Alternate ID(s):
OSTI ID: 1378600
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Vol. 137 Journal Issue: 41; ISSN 0002-7863
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 123 works
Citation information provided by
Web of Science

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