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The Classification and Main Types of Meteorites Essay

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The Classification and Main Types of Meteorites

Many meteorites have been discovered over the years which, in many cases, can give an insight into the creation of the universe. All these meteorites can be grouped together by looking at the various characteristics they have in common, such as the structures of the different meteorites and the isotopic properties of the meteorites. When trying to classify meteorites, they are generally identified as one of the three main groups of meteorites: Iron, Stony and Stony-iron. Each group has its own properties which makes them unique to one another. These groups can be divided further more into smaller groups.
Iron meteorites
Iron meteorites originated from the core of asteroids and can be divided in to many groups depending on their characteristics: list groups
Group IIAB Iron meteorites have low concentrations of nickel compared to other iron groups. The structures vary from Hexahedrites to coarsest octahedrites. Hexahedrites have the lowest concentration of nickel in their structure. IIAB iron meteorites are thought to be highly reduced materials due to the absence of phosphates, low concentration of nickel and the occurrence of graphite [H]. Group IIIAB Iron meteorites are the largest group of Iron meteorites. Meteorites in this category have medium octahedrite structure (most common iron meteorite structure due to certain amount of Nickel concentration). IIIAB iron meteorites are thought to be oxidized materials due to the high abundance of phosphate [H]. Group IVA Iron meteorites are the third largest group and exhibits octahedrite structures. This group of meteorites has an unusually low ratio of Ir/Au. Apart from this the meteorites are not very volatile [H]. Group IVB iron...


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Volume 62, Issue 12, December 2007, Pages 1606–1611
A Collection of Papers Presented at the 4th International Conference on Laser Induced Plasma Spectroscopy and Applications (LIBS 2006)

[B] The Old Woman, California, IIAB iron meteorite
Howard PLOTKIN, Roy S. CLARKE, JR, Timothy J. McCOY, and Catherine M. CORRIGAN

[C] http://www.britannica.com.ezproxy.brad.ac.uk/EBchecked/topic/40454/ataxite
[D] http://giantcrystals.strahlen.org/africa/hoba.htm
[E] http://adsabs.harvard.edu/abs/1978astd.nasa...57A
[F] http://adsabs.harvard.edu/abs/2003TrGeo...1..325H
[G] John T. Wasson, Meteorites
[H] Davis, A. M. (Editor). Treatise on Geochemistry, Volume 1: Meteorites, Comets and Planets.
Amsterdam, NLD: Elsevier Science & Technology, 2006. P327-329.
http://site.ebrary.com/lib/brad/Doc?id=10179924&ppg=346
[x] http://www.spacerocksuk.com/Meteorites.html





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