• 2007 Leonard Medal for Michel Maurette

      Brownlee, Donald (The Meteoritical Society, 2007-01-01)
    • Abstracts

      The Meteoritical Society, 2007-01-01
    • 2007 Barringer Medal for Christian Koeberl

      Reimold, Wolf Uwe (The Meteoritical Society, 2007-01-01)
    • Subject Index

      The Meteoritical Society, 2007-01-01
    • Author Index

      The Meteoritical Society, 2007-01-01
    • The Asco meteorite (1805): New petrographic description, chemical data, and classification

      Gattacceca, J.; Bourot-Denise, M.; Brandstaetter, F.; Folco, L.; Rochette, P. (The Meteoritical Society, 2007-01-01)
      We present magnetic measurements, chemical analyses, and petrographic observations of the poorly studied Asco historical meteorite fall (1805). These new data indicate that this meteorite has been previously misclassified as an L6 ordinary chondrite. Asco is reclassified as an H6 ordinary chondrite with shock stage S3. An interesting feature of this meteorite is the presence of chromiteplagioclase assemblages with variable textures.
    • The Villalbeto de la Peña meteorite fall: III. Bulk chemistry, porosity, magnetic properties, 57Fe Mössbauer spectroscopy, and Raman spectroscopy

      Llorca, J.; Gich, M.; Molins, E. (The Meteoritical Society, 2007-01-01)
      Detailed mineralogical and chemical studies and measurements of the magnetic properties and porosity of the Villalbeto de la Peña (L6) chondrite are reported. The measured abundances of 36 chemical elements are within the range observed for L6 chondrites for most elements, except for Pd and Os, which are particularly abundant in Villalbeto de la Peña. The specific magnetic susceptibility of the meteorite is 4.85 +/- 0.05 (in 10^(-9) m^3kg^(-1)) and the porosity is 4.7%. The JRS/JS (1.2 +/- 0.2 x 10^(-3)) and HC (3.3 x 10^(-4) T) values recorded are among the lowest ever reported for a chondrite. 57Fe Mössbauer spectroscopy of the whole rock indicates that the meteorite faced oxidizing conditions prior to fall. The Mössbauer spectrum of the metal fraction shows the presence of the only ferromagnetic phases kamacite and taenite. No tetrataenite is present, which is in total accordance to magnetic studies. Raman spectra yield compositional values for olivine (Mg ~0.76), orthopyroxene (Mg ~0.79), and clinopyroxene (Mg ~0.49). Raman spectra of phosphate in shock veins indicates that Villalbeto de la Peña was not severely shock-metamorphosed.