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The sample was photo-documented with a JEOL scanning electron microscope at Washington University, St. Louis. Back-scattered electron image (BSE) photo-mosaics were created to be used as location maps and guides for ion probe isotopic analyses. Mineral chemistry was determined with a Cameca Camebax electron microprobe at Johnson Space Center, Houston, TX, operating at 15-kV accelerating potential and 40-nA beam current with counting time of 20 s for Al, Ca, Mn, and Fe and 40 s for Si, Ti, V, Cr, and Mg. Natural and synthetic crystalline standards were used for calibration.
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We thank V. K. Vaya and M. S. Sisodia of J.N.V. University, Jodhpur, for participating in the expedition for search of the Piplia Kalan meteorite fragments used in this study. We thank A. Shukla for help at various stages of this work. The assistance provided by P. Swan (Washington University, St. Louis) for photodocumentation of the section and V. Yang (Johnson Space Center, Houston) for electron microprobe analyses is appreciated. Comments from two referees helped to improve the quality of the paper.
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