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	Classification of Meteorites
		The stony meteorites (chondrites) are the most common, iron meteorites are composed largely of iron and nickel, and carbonaceous chondrites are of particular interest because they contain organic compounds and therefore may hold keys to how life developed in the Solar System.
		Meteorites that are discovered by accident are called "finds"; those discovered because someone has seen a meteorite fall are called "falls" (well, sometimes even scientific nomenclature is simple and logical!).
		In some cases we believe that we have strong evidence for the exact source of particular meteorites because their detailed composition is too similar to the known composition of a parent body to be a coincidence.
	csep10.phys.utk.edu /astr161/lect/meteors/classification.html (836 words)

	CalendarHome.com - - Calendar Encyclopedia (Site not responding. Last check: 2007-11-03)
		Meteorites have traditionally been divided into three broad categories: stony meteorites are rocks, mainly composed of silicate minerals; iron meteorites are largely composed of metallic iron-nickel; and, stony-iron meteorites contain large amounts of both metallic and rocky material.
		Most meteorite falls are recovered on the basis of eye-witness accounts of the fireball or the actual impact of the object on the ground, or both.
		Apart from meteorites fallen onto the Earth, "Heat Shield Rock" is a meteorite which was found on Mars, and two tiny fragments of asteroids were found among the samples collected on the Moon by Apollo 12 (1969) and Apollo 15 (1971) astronauts [4].
	encyclopedia.calendarhome.com /cgi-bin/encyclopedia.pl?p=Meteorite (4043 words)

	Meteorites K-12 Experiments & Background Information
		A small number of meteorites belong to additional groups or subgroups with unique chemical characteristics relative to other members of the larger groups, such as lunar meteorites or Martian meteorites.
		One theory stipulates that a large meteorite impact caused the mass extinction of the dinosaurs.
		The meteorites that struck this area were identified in the 1980s as Martian in origin.
	www.juliantrubin.com /encyclopedia/astronomy/meteorite.html (975 words)

	www.meteorites.com classification
		Meteorite collections are instead dominated by irons, which not only have a distinctive appearance and are therefore easier to spot, but they resist longer than stones to weathering and are particularly amenable to being found by metal detectors.
		In cases where many meteorites representing several falls are found within a relative small area (individual blue ice fields in Antarctica for instance), the meteorites are designated by an abbreviated locality name (the same name for all meteorites from that area) followed by a number giving the year of recovery and a serial number.
		Lunar meteorites may be identified by a fusion crust with slightly greenish hues and by a grayish interior with angular clasts (inclusions) of often brighter materials.
	www.meteorites.com /classif.html (3318 words)

	Planetary Studies Foundation: All About Meteorites
		Classification is then made on the basis of the ratio of metal to silicate present in the various compositions.
		Stony meteorites are the most abundant of the three meteorite groups and come closest to resembling earth rocks in their appearance and composition.
		Meteorite studies have also provided spacecraft designers an economical means to observe the effects of high speed aerodynamics without the costly expense of experimental re-entry vehicles.
	www.planets.org /meteorites.htm (1132 words)

	meteorites and extinctions (Site not responding. Last check: 2007-11-03)
		The fall of meteorites to the Earth's surface is part of the continuing process of accretion of the Earth from the dust and rock of space.
		Stony meteorites are composed mainly of the minerals olivine, and pyroxene.
		Irons - Iron meteorites are composed of alloys of iron and nickel.
	earthsci.org /education/teacher/basicgeol/meteorn_add/met_extinct.html (4657 words)

	Meteors and Meteorites
		The differentiated meteorites, including the irons and stony-irons, appear to be fragments of larger bodies for which separation according to density took place while they were in the molten state after formation.
		The vast majority of meteorites are thought to come from the asteroid belt, but a number have been identified as coming from either the Moon or Mars.
		The Allende meteorite is named for the town in Mexico where it fell in 1969, the same year as another famous meteorite, the Murchison meteorite.
	hyperphysics.phy-astr.gsu.edu /hbase/solar/meteor.html (701 words)

	Meteorites classification - Wikipedia, the free encyclopedia
		The ultimate goal of meteorite classification is to group together all specimens that share a common origin on a single, identifiable "parent body".
		Instead, modern meteorite classification relies on placing specimens into "groups" in which all members share certain key physical, chemical, isotopic, and mineralogical properties that are consistent with a common origin on a single parent body, even if we do not know what that body may be.
		Stony meteorites are then traditionally divided into two other categories: chondrites (groups of meteorites that have undergone little change since their parent bodies originally formed, and are characterized by the presence of chondrules), and achondrites (groups of meteorites that have a complex origin involving asteroidal or planetary differentiation).
	en.wikipedia.org /wiki/Meteorites_classification (820 words)

	HAVE YOUR METEORITE SAMPLES CLASSIFIED
		We will get your meteorite an official name and can recomend a name to the meteoritical society but the final decision on wither you get a place name or a numeric name will be the decision of the meteoritical society.
		Please ensure that what you have however is a real meteorite before you submit it as most of the fee is used up in the classification and we cannot offer a refund if your rock turns out to not be a meteorite.
		Meteorites can be found or bought from professional meteorite dealers.
	www.meteoriteshop.com /class/classify.html (453 words)

	Meteorite.fr - Classification - Iron Meteorites - Main
		Prior to the age of professional meteorite hunting in hot deserts and their robotic recovery in the ice fields of Antarctica, most meteorite finds were irons.
		Based on the specific concentrations of these trace elements and their correlation with the overall nickel content, iron meteorites are classified into several chemical groups, and each group is thought to represent a unique parent body.
		Depending on the occurrence and the distribution of these nickel-iron alloys, etched iron meteorites display characteristic structures that are used to classify iron meteorites into octahedrites, hexahedrites, and ataxites.
	www.meteorite.fr /en/classification/ironmain.htm (847 words)

	Meteroites, Impacts, & Mass Extinction
		The fall of meteorites to the Earth's surface is part of the continuing process of accretion of the Earth from the dust and rock of space.
		They are the most common type of meteorite, although because they resemble Earth rocks they are not commonly recognized as meteorites unless someone actually witnesses their fall.
		Stony meteorites are composed mainly of the minerals olivine, and pyroxene.
	www.tulane.edu /~sanelson/geol204/impacts.htm (4620 words)

	Meteorite.fr - Classification - Stony Meteorites - Martian Meteorites
		The SNC group is named for the historic meteorite falls of Shergotty, Nakhla, and Chassigny, each representing a distinct rock type of a common parent body.
		These meteorites were initially classified with the HED group, but were later reclassified when their young crystallization ages were ascertained, and their unique oxygen isotope fractionation line was determined.
		As a witnessed fall that was recovered in the early days of meteoritics, it was one of the first meteorites to be recognized as a genuine rock from space, and it subsequently proved to be one of the most intriguing ones.
	www.meteorite.fr /en/classification/SNC-group.htm (2209 words)

	PSF: What is a Meteorite?
		Meteorites are classified into three main groups because of their particular mineral compositions: irons, stony-irons, and stones.
		Because of their metal content most, but not all, meteorites will be strongly attracted to a magnet.
		Furnace and smelter slag often look like meteorites, but because of their generally light weight and porous texture they can easily be distinguished from meteorites.
	www.bccmeteorites.com /met.htm (1133 words)

	AMNH Research \| Earth and Planetary Sciences - Meteorite Collection (Site not responding. Last check: 2007-11-03)
		The first meteorite in the collection was a 46g piece of the Searsmont (H5 ordinary chondrite) donated in 1872 by Mr.
		It was complemented in 1906 by the purchase of the magnificent 15.5 ton Willamette (IIIA) iron meteorite by Mrs.
		The pits and grooves were produced by weathering of the exposed surface of the meteorite in the wet Oregon climate.
	research.amnh.org /earthplan/Collections/Meteorites (704 words)

	Teacher Page: Edible Rocks
		Meteorites are mostly pieces of rock, though a few are metal, that fall to Earth from space.
		Meteorites come in a variety of types and a wide range of sizes and shapes, but most meteorites have two things in common: they have dark brown or fl glassy crusts on the outside and contain enough iron metal to attract a magnet.
		The simplest classification of meteorites into stony, iron, and stony-iron types is based on the amount of iron metal and silicate minerals in the meteorite.
	www.spacegrant.hawaii.edu /class_acts/EdibleRocksTe.html (1046 words)

	Meteorites
		Meteorites were originally classified based on their textures into the categories: Stones, Stony-irons, and Irons.
		Iron meteorites are those that are composed of iron-nickel metal and most of these groups are thought to be the cores of differentiated asteroids.
		Stone meteorites are composed mostly of silicate material and are further split into two classes.
	epsc.wustl.edu /emp/personal/metclass.html (180 words)

	Meteors - Crystalinks
		A meteorite is an extraterrestrial body that survives its impact with the Earth's surface without being destroyed.
		The only known examples of meteorites that didn't fall on Earth are Heat Shield Rock, which was found on Mars, and two tiny fragments of asteroids that were found among the samples collected on the Moon by Apollo 12 (1969) and Apollo 15 (1971) astronauts.
		Most meteoroids disintegrate when entering the Earth's atmosphere, however an estimated 500 meteorites ranging in size from peas to basketballs or larger do reach the surface each year; only 5 or 6 of these are typically recovered and made known to scientists.
	www.crystalinks.com /meteors.html (1911 words)

	Meteorites: Stones from the Sky
		Meteorites are fragments of other worlds that have survived the entry into the Earth's atmosphere.
		The iron meteorites we are handling in class are samples of the cores of worlds formed out beyond the orbit of Mars.
		Meteorites that come from such a small, undifferentiated body are called primitive meteorites.
	www.astro.washington.edu /labs/clearinghouse150/labs/Meteors/meteors.html (1038 words)

	Meteorite Density (Densities of Meteorites by Classification) - Meteorites Australia
		Meteorite Density (Densities of Meteorites by Classification) - Meteorites Australia
		Below is a list of meteorite densities for an array of various classifications.
		In some cases where it was not possible to determine the porosity of a meteorite, the average grain density of the meteorites' minerals is used instead of the overall bulk density.
	www.meteorites.com.au /odds&ends/density.html (233 words)

	Types of Meteorites
		Chondrites are stony meteorites that are characterized by the presence of chondrules.
		These meteorites are made of an iron-nickel alloy and are thought to originate from the cores of broken up differentiated parent bodies.
		These meteorites are mixtures of an iron-nickel alloy and non-metallic minerals and are thought to originate from the core-mantle boundary of a broken up differentiated parent body.
	www7430.nrlssc.navy.mil /facilities/emf/metclass.htm (390 words)

	New Mars Meteorite Descriptions From Meteoritical Bulletin Annoucement 86-1
		Since these two Mars meteorite were found near the other four SAU Mars meteorites and are also basaltic shergottites, they are assumed to be paired with this group.
		This meteorite was recovered from an area near the Dhofar 019 basaltic shergottite, but the two meteorites are probably not paired.
		Grove Mountains (GRV) 99027 73°06'01" S, 75°14'13" E Antarctica Found 2000 February 8 Martian meteorite (lherzolitic shergottite) This meteorite weighs 9.97 g, and most of the surface is covered by fusion crust.
	www2.jpl.nasa.gov /snc/news47.html (627 words)

	We over us of the Haberer-meteorite team
		Each meteorite coming to earth is unique and differs regarding origin, construct, structure and mineral consistence both earthly rock and other meteorites.
		According to the prevailing mineral consistences three main meteorite types were distinguished, the iron meteorites, the stony-iron meteorites and the stony meteorites.
		On the other hand, one had to assess that many stony meteorites chemically were very familiar to certain iron meteorites, what suggests that they come from one and the same mother body.
	www.haberer-meteorite.de /english/Classification.htm (297 words)

	[46.05] Physical classification of meteorites and the remote classification of asteroid composition (Site not responding. Last check: 2007-11-03)
		Connecting a given meteorite type with a particular asteroid class is usually done by comparing the meteorite chemical and mineralogical composition to the spectral reflectance properties of the asteroid surface.
		Most importantly, this classification is determined by the characteristics of the whole rock, not just a small piece on a thin section, thus accounting for inhomogeneities within the sample.
		This classification technique (to be extended to other meteorite classes) allows the rapid characterization of returned samples from asteroid missions, without any contamination or loss of material.
	www.aas.org /publications/baas/v36n4/dps2004/52.htm (308 words)

	Learn about Meteorites
		Meteorite FAQs is a site put together by Ari Manchez with the help of quite a few people in the Meteorite Community including researchers, dealers, and the former administrator of the IMCA.
		The Meteoritical Society is the international network of scientists, and laboratories officially identifying, classifying, naming, and publishing new meteorites.
		Once a year, all new meteorites accepted by the Meteoritical Society are published in the respective issues of the Meteoritical Bulletin, and in the journal Meteorites & Planetary Science.
	imca.repetti.net /learn.htm (2022 words)

	Meteorites: The Meteorite Classification System
		As new discoveries are made, the system is updated to accomodate the new members of the meteorite family.
		These are anomalous meteorites that are to few in number to justify the creation of a new meteorite group.
		A basaltic meteorite, it is a differentiated igneous, silicate- and calcium-rich with pigeonite as the primary mafic mineral.
	www.astrodigital.org /astronomy/metcat.html (662 words)

	Catalogs and Inventories
		A 150 g meteorite was brought to the attention of Bruno Fectay and Carine Bidaut by nomads seeking to sell the specimen.
		Two meteorite fragments that fit together, weighing a total of 23.03 g (BC 001), and an 80.8 g stone (BC 002) were recovered by Nicholas Gessler from the surface of a dry lake near the town of Bonnie Claire; all three pieces were found within a meter of each other.
		A 59 kg meteorite was found ~1 m underground by a farmer digging holes to plant trees.
	tin.er.usgs.gov /meteor/docs/mb83.html (2781 words)

	Meteorite Books For Sale - Tektite Books For Sale
		A short appendix of minerals found in meteorites is included, as well as a fairly comprehensive 8-page glossary of terms relative to understanding all phases of the study of meteorites, their composition, and their origins.
		Meteorites offer important insights into processes in stars and in interstellar regions, the birth of our solar system, the formation and evolution of planets and smaller bodies, and the origin of life.
		Meteorites, which range in size from particles of dust to massive chunks of metal and rock, bombard the Earth constantly, adding hundreds of tons of new material to our planet each day.
	www.meteorite.com /meteorite-books.htm (6671 words)

	Meteorite / Chondrite / Franconia Meteorites For Sale
		I refer to it as a "Franconia Meteorite" because a representative sample has been studied and classified by Arizona State University and it appears that its H-5 classification will pair it with the original Franconia meteorite.
		Most of the small Franconia meteorites sat right on the surface or rested in the desert pavement before being collected.
		If you see a meteorite that you are interested in, or if you have any questions please feel free to contact us.
	www.arizonaskiesmeteorites.com /AZ_Skies_Links/Chondrites/Franconia (465 words)

	meteorite: Classification of Meteorites — FactMonster.com
		The age of meteorites can be determined by measuring their radium and helium contents.
		These lunar and Martian meteorites are thought to have been broken away from the moon and Mars by the impact of large asteroids.
		The aerolites, or stony meteorites, show a diversity of mineral elements including large percentages of silicon and magnesium oxides; the most abundant type of aerolite is the chondrite, so called because the metal embedded in it is in the form of grainlike lumps, or chondrules.
	www.factmonster.com /ce6/sci/A0859592.html (317 words)

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