Jump to main content
Jump to site search

Issue 22, 2011
Previous Article Next Article

Atomic order of aragonite crystals formed by mollusks

Author affiliations

Abstract

Aragonite is the most common polymorph of calcium carbonate produced by mollusks. The crystals have different shapes and sizes, and are intimately associated with an organic matrix. Here we adapt an infrared spectroscopic method that was developed to characterize atomic disorder in calcite crystals, in order to characterize aragonite crystals produced by mollusks, as well as geogenic and synthetic aragonite crystals. The method involves systematically changing the particle size distribution by repeated grinding of the sample. We show that large single geogenic aragonite crystals are well ordered compared to aragonite formed from boiling water, which in turn is better ordered than synthetic aragonite crystals produced in vitro in the presence of additives. The most ordered biogenic aragonite is from the crossed lamellar structure. Nacre and myostracum are less ordered and the large ligament crystals are even less ordered than nacre. These trends do not correspond to those observed from X-ray diffraction peak broadening, indicating that the two techniques reflect different types of ordering. The differences in atomic order observed by infrared spectroscopy between biogenic aragonite crystals and also between geogenic aragonite crystals presumably reflect different modes of crystal formation.

Graphical abstract: Atomic order of aragonite crystals formed by mollusks

Back to tab navigation

Publication details

The article was received on 17 May 2011, accepted on 12 Aug 2011 and first published on 13 Sep 2011


Article type: Paper
DOI: 10.1039/C1CE05572K
CrystEngComm, 2011,13, 6780-6786

  •   Request permissions

    Atomic order of aragonite crystals formed by mollusks

    M. Suzuki, Y. Dauphin, L. Addadi and S. Weiner, CrystEngComm, 2011, 13, 6780
    DOI: 10.1039/C1CE05572K

Search articles by author

Spotlight

Advertisements