Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 1 September 1967:
Vol. 157. no. 3792, pp. 1048 - 1050
DOI: 10.1126/science.157.3792.1048
Prev | Table of Contents | Next

Articles

Echinoderm Calcite: Single Crystal or Polycrystalline Aggregate

Kenneth M. Towe 1

1 Department of Paleobiology, Smithsonian Institution, Washington, D.C. 20560

Electron microscopy of natural and broken surfaces of echinoid skeletal plates reveals that the interior portions have the morphology of a single crystal, whereas the exterior is a polycrystalline aggregate with preferred orientation. These data help to resolve earlier contradictory x-ray and optical evidence.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Cave Pearls--The Integrated Product of Abiogenic and Biogenic Processes.
B. Jones (2009)
Journal of Sedimentary Research 79, 689-710
   Abstract »    Full Text »    PDF »
Sea Urchin Spine Calcite Forms via a Transient Amorphous Calcium Carbonate Phase.
Y. Politi, T. Arad, E. Klein, S. Weiner, and L. Addadi (2004)
Science 306, 1161-1164
   Abstract »    Full Text »    PDF »
Single crystal structure analysis of sea urchin spine calcites: Systematic investigations of the Ca/Mg distribution as a function of habitat of the sea urchin and the sample location in the spine.
U. MAGDANS and H. GIES (2004)
European Journal of Mineralogy 16, 261-268
   Abstract »    Full Text »    PDF »
Petrography and Significance of Zoned Dolomite Cements from the Cayman Formation (Miocene) of Cayman Brac, British West Indies.
(2004)
Journal of Sedimentary Research 74, 95-109
Biological Control of Crystal Texture: A Widespread Strategy for Adapting Crystal Properties to Function.
A. Berman, J. Hanson, L. Leiserowitz, T. F. Koetzle, S. Weiner, and L. Addadi (1993)
Science 259, 776-779
   Abstract »    PDF »
Intercalation of Sea Urchin Proteins in Calcite: Study of a Crystalline Composite Material.
A. Berman, A. Berman, L. Addadi, A. Kvick, L. Leiserowitz, M. Nelson, and S. Weiner (1990)
Science 250, 664-667
   Abstract »    PDF »
Polycrystalline Echinoderm Calcite and Its Fracture Mechanics.
P. L. O'Neill and P. L. O'NEILL (1981)
Science 213, 646-648
   Abstract »    PDF »
X-ray Diffraction Studies of Echinoderm Plates.
G. Donnay, G. Donnay, and D. L. Pawson (1969)
Science 166, 1147-1150
   Abstract »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)