Cometary Particles: Thin Sectioning and Electron Beam Analysis

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Science  28 Mar 1986:
Vol. 231, Issue 4745, pp. 1542-1544
DOI: 10.1126/science.231.4745.1542


Thin sections (500 to 1000 angstroms thick) of individual micrometeorites (5 to 15 micrometers) have been prepared with an ultramicrotome equipped with a diamond knife. Electron microscopic examination of these sections has revealed the internal structures of chondritic micrometeorites, and a subset of highly porous, fragile particles has been identified. Delicate meteoritic materials such as these are characteristic of debris from cometary meteors.