Authors:Razilia Muftakhetdinova, Evgenia Brusnitsina, Grigoriy Yakovlev and Victor Grokhovsky
could be found in stone, iron, and stony-iron meteorites. Features of meteoritical structure formation were determined by the influence of space vacuum, extremely high and low temperatures, slow cooling (about tens of Kelvins per million years and lower
Authors:Ildikó Gyollai, Ákos Kereszturi and Elias Chatzitheodoridis
The Zagami meteorite fell on October 3, 1962, about 0.75 miles from Zagami Rock, Katsina Province, Nigeria ( Graham et al. 1985 ). It was the second meteorite found to contain a significant amounts of trapped
Authors:A. Bahgat, M. Ahmed, A. Barakat and T. Ramadan
A stone of brick-like shape, measuring roughly 25×12.5×10.5 cm3 and weighing 14 kg was found in 1983, in the western desert of Egypt. The meteorite was named El-Bahrain meteorite and classified as L-chondrite. In the present paper, the principal constituents of El-Bahrain meteorite have been studied by means of Mössbauer spectroscopy. The chemical composition as obtained by the conventional wet analyses of L-chondritic meteorites showed that the meteorite contains 23.38% Fe and 1.23% Ni. While the analysis of the atomic absorption showed the presence of 27.03% as a total iron. The Mössbauer analysis of El-Bahrain meteorite showed that the iron constituent minerals were determined to be olivine, metallic iron-nickel alloys (kamacite, taenite and tetrataenite), ferrous sulfide (troilite) and weathering products such as maghemite and nanocrystalline hematite. The structure of meteoritic iron obtained by the Mössbauer analysis has been discussed on the basis of these constituents.
Authors:J. Niewodniczański, A. Manecki and B. Dominik
Application of a portable radioisotope X-ray fluorescence analyser for the determination of nickel in iron meteorites is described.
The error of the XRF method was ±0.5% Ni at the 95% confidence level, which was confirmed by comparison with the results of
other authors. In spite of limited accuracy this version of the radioisotope XRF method may find a wide application in meteorite
studies, for rapid and non-destructive verification and classification of collected meteorite specimens.
The 57Fe Mössbauer spectrum of Kaba (Hungary) meteorite was recorded at room and at liquid nitrogen temperatures. The evaluation of the spectrum showed that the iron containing components of the Kaba meteorite are magnetite, maghemite, troilite, fayalite and pentlandite.