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Detail of a polished and etched slice from a siderite iron meteorite found in the Brenham, Kansas strewnfield in by professional meteorite hunter Steve Arnold. The slice has been etched with a mild solution of nitric acid to reveal an interlocking pattern of iron-nickel alloys, taenite and kamacite.
Photo by Geoffrey Notkin, copyright Aerolite Meteorites. It is often said that when the average person imagines what a meteorite looks like, they think of an iron. It is easy to see why. Iron meteorites are dense, very heavy, and have often been forged into unusual or even spectacular shapes as they plummet, melting, through our planet's atmosphere.
Though irons may be synonymous with most people's perception of a typical space rock's appearance, they are only one of three main meteorite types, and rather uncommon compared to stone meteorites, especially the most abundant stone meteorite group-the ordinary chondrites.
A superb 1,gram complete iron meteorite from the Sikhote-Alin meteorite shower which occurred in a remote part of eastern Siberia in the winter of This fine specimen is described as a complete individual, as it flew through the atmosphere in one piece, without fragmenting.
Its surface is covered with scores of small regmaglypts, or thumbprints, created by melting during flight. The Sikhote-Alin shower was the largest recorded witnessed meteorite fall in history.
Although there are a large number of sub classes, meteorites are divided into three main groups: Almost all meteorites contain extraterrestrial nickel and iron, and those that contain no iron at all are so rare that when we are asked for help and advice on identifying possible space rocks, we usually discount anything that does not contain significant amounts of metal.
Much of meteorite classification is based, in fact, on how much iron a specimen does contain. It was a witnessed fall and is a rare type of achondrite—a stone meteorite which does not contain chondrules.
Eucrites are volcanic rocks from other bodies in the solar system, and Millbillillie is one of the very few meteorites which does not contain iron-nickel.
Note the glossy black fusion crust, and fine flow lines which were caused as the surface of the meteorite melted during flight.
This specimen is also highly oriented, with a textbook snub-nosed leading edge pictured and a flat back. Iron Meteorites When I give lectures and slideshows about meteorites to rock and mineral societies, museums, and schools, I always enjoy commencing the presentation by passing around a softball-sized iron meteorite.
Most people have never held a space rock in their hands and when someone does pick up an iron meteorite for the first time their face lights up and their reaction is, almost without fail, to exclaim: They are among the densest materials on earth and will stick very strongly to a powerful magnet.
Iron meteorites are far heavier than most earth rocks-if you've ever lifted up a cannon ball or a slab of iron or steel, you'll get the idea. Iron meteorites are subdivided into classes both by chemical composition and structure.
Structural classes are determined by studying their two component iron-nickel alloys: This remarkable lattice-like arrangement can be very beautiful and is normally only visible when iron meteorites are cut into slabs, polished, and then etched with a mild solution of nitric acid.
The kamacite crystals revealed by this process are measured and the average bandwidth is used to subdivide iron meteorites into a number of structural classes. An iron with very narrow bands, less than 1mm, would be a "fine octahedrite" and those with wide bands would be called "coarse octahedrites.
Detail of prepared slice of the carbonaceous chondrite Allende, which was seen to fall in Chihuahua, Mexico on the night of February 8,following a massive fireball.
Allende contains carbonaceous compounds as well as calcium-rich inclusions large white circle near center.Astronomy term papers (paper ) on Asteroids: In our solar system today there are over 30 asteroids flying around in all directions colliding with other asteroids and planets not ca.
Term paper The main body of comet is called the nucleus, which can contain water, methane, nitrogen and other ice. Asteroids is a small rocky body orbiting the sun large numbers of these, ranging enormously in size, are found between the orbits of mars and Jupiter, though some have more eccentric orbits.
Shooting Stars have been associated with good luck. Many lovers during the meteor shower will go outside at night just to watch at the falling stars.
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Rene Descartes This Essay Rene Descartes and other 64,+ term papers, college essay examples and free essays are available now on lausannecongress2018.com Autor: review • November 28, • Essay • Words (3 Pages) • Views. Meteors and Meteorites Abstract The study discusses the subject involving meteors and meteorites wherein the comprising sections are its compositions, origin, classifications, and the history and records of meteorite collision on Earth - .