www.niger-meteorite-recon.de Meteoritica go to page 1 | 2 | 3 | 4 | 5 | historic sources for sale Inventory # C 019 Das Meteoreisen von N'Goureyma unweit Djenne, Provinz Macina, Sudan. Von E. Cohen. Mittheilungen aus dem Naturwissenschaftlichen Verein fuer Neu-Vorpommern und Ruegen 1901. XXXIII. Greifswald 1901. Account on the fall, recovery and analysis of the unique N'Goureyma iron by the grandmaster of iron meteorites Emil Cohen. The author describes the exceptional meteorite as an oriented shield and provides in total three photographic images that were taken on behalf of Minod. Because the chemical analysis of the meteorite had already been completed and preliminary results were published by Meunier, Cohen focusses on the shape and the reconstruction of flight and ablation processes that lead to the particular form of the meteorite. Cohen compares certain features of the fusion texture of N'Goureyma with those on Cabin Creek and he notes that on both meteorites the fusion crust is missing on the apex. He concludes that the blast of "compressed air" must have eroded the most protruding part of the apex free from any fusion crust. While some of Cohen's explanations on the flight history of the N'Goureyma iron will find acceptance by today's meteoriticists he is still convinced that due to the marginal thickness of the shield most of the mass, if not the complete meteorite, was molten or "softed" during the hot flight. Obviously Cohen was irritated by the ataxitic structure of the meteorite. In his conclusion he suggests that N'Goureyma originally entered Earth's atmosphere as an octahedric iron that was subsequently to its entry completely molten during the atmospheric flight. go to page 1 | 2 | 3 | 4 | 5 | historic sources for sale     © 2001-2008 NigerMeteoriteRecon