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GEOREF RECORD

The microstructure of the fibrous layer of terebratulide brachiopod shell calcite

Wolfgang W. Schmahl, Erika Griesshaber, Rolf Neuser, Annette Lenze, Reinhart Job and Uwe Brand
The microstructure of the fibrous layer of terebratulide brachiopod shell calcite
European Journal of Mineralogy (August 2004) 16 (4): 693-697

Abstract

The ultrastructure of the secondary layer of the calcite shell of the terebratulid Megerlia truncata was investigated using SEM and electron beam backscattering diffraction. The material of this secondary layer is an inorganic /organic fibre composite. Each individual cell of the outer epithelium secretes a single crystal confined within a protein sheath. The morphological fibre axes of the single crystals are almost parallel to the shell surface. The fibrous growth occurs in arbitrary directions perpendicular to the <0001> trigonal symmetry of calcite. Accordingly, the fibres form a cylindrical <0001> 'fibre' texture, with the texture axis perpendicular to the shell surface. The curvature of the fibres is caused by lateral displacements or rearrangements of the array of secreting cells during growth. In these events the existing crystal lattice is not distorted - it is the substrate for continued crystal growth from the cell, irrespective of direction.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 16
Serial Issue: 4
Title: The microstructure of the fibrous layer of terebratulide brachiopod shell calcite
Affiliation: Ruhr-Universitaet Bochum, Institut fuer Geologie, Mineralogie und Geophysik, Bochum, Federal Republic of Germany
Pages: 693-697
Published: 200408
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 24
Accession Number: 2007-037373
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Fernuniversitaet Hagen, DEU, Federal Republic of GermanyBrock University, CAN, Canada
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200720
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