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Preliminary SEM/EDAX studies of the Tissint meteorite shows projections of interior spherical globules rich in C and O. Such concentrations of carbonaceous material in a matrix of mineral grains pose a mystery. These structures are consistent with remnants of biological structures.
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Jamie Wallis, N. Chandra Wickramasinghe, Daryl H. Wallis, Nori Miyake, Max K. Wallis, Barry Di Gregorio, Richard Hoover, "Possible biological structures in the Tissint Mars Meteorite," Proc. SPIE 8521, Instruments, Methods, and Missions for Astrobiology XV, 85210R (24 October 2012); https://doi.org/10.1117/12.2013827