The Textural Motif of Foliated Calcite in Ostreoidea (Mollusca)
The microstructure of bivalve foliated calcite is extraordinary. It consists of units formed of stacks of folia with individual folia consisting of arrowhead-ended crystal laths. We investigated the texture of the foliated microstructure, the texture of individual and arrays of folia and the texture...
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2025-03-01
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| author | Erika Griesshaber Anna Sancho Vaquer Antonio G. Checa Carmen Salas Elizabeth M. Harper Wolfgang W. Schmahl |
| author_facet | Erika Griesshaber Anna Sancho Vaquer Antonio G. Checa Carmen Salas Elizabeth M. Harper Wolfgang W. Schmahl |
| author_sort | Erika Griesshaber |
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| description | The microstructure of bivalve foliated calcite is extraordinary. It consists of units formed of stacks of folia with individual folia consisting of arrowhead-ended crystal laths. We investigated the texture of the foliated microstructure, the texture of individual and arrays of folia and the texture of assemblies of foliated units of the gryphaeid oyster <i>Hyotissa hyotis</i> with low kV, high-resolution, electron backscatter diffraction (EBSD). We base our understanding of the foliated texture on the combined interpretation of crystallographic aspects of individual and stacks of folia with the nature of crystal organization in a folium, a foliated unit and in foliated unit aggregations. Calcite c- and a*-axes arrangement in a folium is single-crystal-like. Due to the parallel organization of adjacent laths in a folium and the stacked arrangement of folia in a foliated unit, the assembly of calcite c- and a*-axes in foliated units is graded. The result is a ring-like distribution of c- and a*-axes orientations in the pole figures; nonetheless, the orientation rings are substructured by c- and a*-axes orientation clusters. The direction of the arrowhead endings of the laths is coincident with the growth direction of the shell. The morphology of arrowheaded laths initiates the formation of planes with {105}, {106} directions and a parallel orientation to the inner shell surface. <i>H. hyotis</i>’s foliated microstructure has a specific texture that is not fully understood. We discuss axial, spherulitic, turbostratic-like textures the foliated microstructure and suggest that the foliated texture of <i>H. hyotis</i> can, to some degree, be described with a turbostratic pattern. |
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| issn | 2073-4352 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
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| series | Crystals |
| spelling | doaj-art-3f0f28b201a947e0a1e93d93a19a686c2025-08-20T02:11:09ZengMDPI AGCrystals2073-43522025-03-0115324410.3390/cryst15030244The Textural Motif of Foliated Calcite in Ostreoidea (Mollusca)Erika Griesshaber0Anna Sancho Vaquer1Antonio G. Checa2Carmen Salas3Elizabeth M. Harper4Wolfgang W. Schmahl5Department of Geo- and Environmental Sciences, Ludwig-Maximilians-Universität München, 80333 Munich, GermanyDepartment of Geo- and Environmental Sciences, Ludwig-Maximilians-Universität München, 80333 Munich, GermanyDepartamento de Estratigrafía y Paleontología, Universidad de Granada, 18071 Granada, SpainDepartamento de Biología Animal, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, SpainDepartment of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UKDepartment of Geo- and Environmental Sciences, Ludwig-Maximilians-Universität München, 80333 Munich, GermanyThe microstructure of bivalve foliated calcite is extraordinary. It consists of units formed of stacks of folia with individual folia consisting of arrowhead-ended crystal laths. We investigated the texture of the foliated microstructure, the texture of individual and arrays of folia and the texture of assemblies of foliated units of the gryphaeid oyster <i>Hyotissa hyotis</i> with low kV, high-resolution, electron backscatter diffraction (EBSD). We base our understanding of the foliated texture on the combined interpretation of crystallographic aspects of individual and stacks of folia with the nature of crystal organization in a folium, a foliated unit and in foliated unit aggregations. Calcite c- and a*-axes arrangement in a folium is single-crystal-like. Due to the parallel organization of adjacent laths in a folium and the stacked arrangement of folia in a foliated unit, the assembly of calcite c- and a*-axes in foliated units is graded. The result is a ring-like distribution of c- and a*-axes orientations in the pole figures; nonetheless, the orientation rings are substructured by c- and a*-axes orientation clusters. The direction of the arrowhead endings of the laths is coincident with the growth direction of the shell. The morphology of arrowheaded laths initiates the formation of planes with {105}, {106} directions and a parallel orientation to the inner shell surface. <i>H. hyotis</i>’s foliated microstructure has a specific texture that is not fully understood. We discuss axial, spherulitic, turbostratic-like textures the foliated microstructure and suggest that the foliated texture of <i>H. hyotis</i> can, to some degree, be described with a turbostratic pattern.https://www.mdpi.com/2073-4352/15/3/244turbostratic texturehigh-resolution EBSDassembly of folia and foliated unitsgraded c- and a*-axes orientations of biocalcitespherulitic texture of biocalciteaxial texture of biocalcite |
| spellingShingle | Erika Griesshaber Anna Sancho Vaquer Antonio G. Checa Carmen Salas Elizabeth M. Harper Wolfgang W. Schmahl The Textural Motif of Foliated Calcite in Ostreoidea (Mollusca) Crystals turbostratic texture high-resolution EBSD assembly of folia and foliated units graded c- and a*-axes orientations of biocalcite spherulitic texture of biocalcite axial texture of biocalcite |
| title | The Textural Motif of Foliated Calcite in Ostreoidea (Mollusca) |
| title_full | The Textural Motif of Foliated Calcite in Ostreoidea (Mollusca) |
| title_fullStr | The Textural Motif of Foliated Calcite in Ostreoidea (Mollusca) |
| title_full_unstemmed | The Textural Motif of Foliated Calcite in Ostreoidea (Mollusca) |
| title_short | The Textural Motif of Foliated Calcite in Ostreoidea (Mollusca) |
| title_sort | textural motif of foliated calcite in ostreoidea mollusca |
| topic | turbostratic texture high-resolution EBSD assembly of folia and foliated units graded c- and a*-axes orientations of biocalcite spherulitic texture of biocalcite axial texture of biocalcite |
| url | https://www.mdpi.com/2073-4352/15/3/244 |
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