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The hollow spheres of the Orgueil meteorite: a re-examination

Here we re-examine the 1971 description of the acid-resistant, organic "hollow spheres" of the Orgueil meteorite by Rossignol-Strick and Barghoorn. They form a possible basis for comparison with the results of recent studies of the Orgueil meteorite that have been carried out at the NASA/Marshall Space Flight Center with the S-4000 Hitachi Field Emission Scanning Electron Microscope (FESEM). These investigations have revealed the presence of numerous carbon encrusted spherical magnetite platelets and spherical and ovoid bodies of elemental iron in-situ in freshly fractured interior surfaces of the meteorite. Their size range is from 5 to 12 microns. High-resolution images reveal that these bodies are also encrusted with a thin carbonaceous sheath and are surrounded by short nanofibrils shown as made of high purity iron by EDAX elemental analysis. We present high resolution FESEM images and associated EDAX elemental analyses of these forms and attempt to determine if they are representatives of the same population of indigenous microstructures as the hollow spheres.