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Topic: Hexahedrite

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	Kamacite - Wikipedia, the free encyclopedia
		It is a major constituent of iron meteorites (octahedrite and hexahedrite types).
		In the octahedrites it is found in bands interleaving with taenite forming Widmanstätten patterns.
		In hexahedrites, fine parallel lines called Neumann lines are often seen, which are evidence for structural deformation of adjacent kamacite plates due to shock from impacts.
	en.wikipedia.org /?title=Kamacite (200 words)

	hexahedrite
		Hexahedrites have a nickel content of about 6% and are 92% composed of the nickel-iron mineral kamacite.
		Etching the polished surface of a hexahedrite reveals no Widmanstätten pattern but does often bring out a pattern known as Neumann lines caused by the presence of systems of narrow, flat lamellae (plates) in the kamacite.
		These lamellae are believed to have been shock-induced, suggesting that the hexahedrite parent body experienced a major impact.
	www.daviddarling.info /encyclopedia/H/hexahedrite.html (172 words)

	CARVER PHOTO
		Carver was originally a single hexahedrite crystal that experienced a violent shock event accompanied by relaxation heating.
		This was followed by recrystallization of the metal forming a structure composed of a polycrystalline assemblage of small mm-sized grains of kamacite.
		Five other hexahedrites have been found in the Southeast U. but all are chemically distinct and unpaired.
	www.meteoritestudies.com /protected_CARVER.HTM (150 words)

	Untitled
		Cedartown: This 11.6 kilogram (25.5 pound) iron meteorite (hexahedrite - IIA) was found sometime before 1898 in a field between Cedartown and Cave Springs in Polk County.
		The meteorite is classified as an iron hexahedrite (IIA).
		Smithonia: An iron meteorite (hexahedrite — IIA) was found in Oglethorpe County in 1940.
	fsc.fernbank.edu /Astronomy/Meteorite/ga-catalog.htm (886 words)

	Astrospace :: An Introduction to Meteorites and Meteoritics (Site not responding. Last check: 2007-10-30)
		The word “hexahedrite” comes from the type of crystalline form, a hexahedron or six-sided crystal.
		Octahedrite, like hexahedrite, comes from the fact that they contain octahedron, or eight-sided crystals in addition to the iron and nickel matrix.
		Hexahedrites also can produce a series of lines or bands, called Neumann Lines, named for its discoverer, Johann Neumann, who detailed them in 1848.
	www.astrospace.net /Meteorites.html (1508 words)

	Kamacite - Biocrawler (Site not responding. Last check: 2007-10-30)
		It was first named in 1861 from the Greek kamask (lath or beam).
		Meteoric kamacite is found in bands in octahedrites or hexahedrites, these sometimes contains Neumann bands, evidence of impact, or Widmanstätten's patterns.
		It is difficult to distinguish visually from the similar meteor alloy taenite and the two can be found closely intermixed as plessite.
	www.biocrawler.com /encyclopedia/Kamacite (236 words)

	MeteoriteKit: Glossary
		Hexahedrites, one of the types of Iron meteorites, contain iron, between 4.5 and 6.5 percent nickel, and large crystals of kamacite, an iron-nickel crystal containing up to 7.5 percent nickel.
		Hexahedrites are named for its cubic (hexahedral) crystal structure.
		When cut, polished and etched with nitric acid or ferric chloride, Hexahedrites produce a series of lines called the Neumann lines.
	www.meteoritekit.com /glossary/index.html (2670 words)

	Geoscience - Meteors and meteorites - Types of meteorites
		Irons are the second most common type of meteorite and have the largest masses, such as the 12 tonne 'Mundrabilla', Western Australia iron.
		Irons are made of dense silvery nickel-iron metal alloys (taenite and kamacite) and have a range of nickel contents from about 4% (Hexahedrite Class) to 6 - 12% (Octahedrite Class) to over 20% (Ataxite Class).
		When cut, polished and etched with an acid/alcohol solution, some (the Octahedrite Class) show a characteristic criss-cross pattern of intersecting platy nickel-iron crystals known as Widmanstatten structure.
	www.amonline.net.au /geoscience/meteors/types.htm (381 words)

	The Montréal Planetarium — What's Up — Meteorites, Messengers from Space
		There are three types of iron meteorites, which have different structures depending on how much nickel is combined with the iron.
		Hexahedrites contain little nickel (4.5 to 6.5%)-their main alloy is kamacite.
		Hexahedrites show no structure except for many fine, parallel lines called Neumann lines.
	www2.ville.montreal.qc.ca /planetarium/Information/Expo_Meteorites/Classes/classes_02_a.html (260 words)

	Meteoritical Bulletin: Entry for Allan Hills A81013
		The matrix appears to be single crystal kamacite that etches to a dull finish, atypical for hexahedrites.
		This cursory examination suggests that the meteorite is a hexahedrite of somewhat unusual metallography.
		It probably represents a separate fall, distinct from the typical hexahedrite ALHA78100.
	tin.er.usgs.gov /meteor/metbull.php?code=1973 (380 words)

	TOMBIGBEE RIVER PHOTO
		Most specimens in this group have a hexahedrite-like matrix consisting predominately of kamacite, but one Tombigbee River mass, which is lower in P and higher in Ni, shows a small area with a remnant coarse Thomson (Widmanstätten) structure.
		It was proposed by Vagn F. Buchwald that these irons be structurally classified as hexahedrite, transitional to coarsest octahedrite (H-Ogg).
		The masses have been terrestrially corroded but rare fusion crust and heat-affected zones are still visible.
	www.meteoritestudies.com /protected_TOMBIG.HTM (540 words)

	apfalls
		Sakauchi was a hexahedrite, a Ni-poor variety of the iron meteorites.
		Indeed, some hexahedrites are simply single huge iron crystals.
		Since “hexahedrite” is simply a mineralogical term for a symmetric regular six-faced object — the reader may eventually realize that some of these meteorites are not much more than big iron blocks or “cubes” which can weigh a kilogram — or a ton!!
	www1.broward.edu /~lhill/apfalls.html (2630 words)

	Meteorite / Iron Meteorite / Recrystalized IIAB Hexahedrite
		Meteorite / Iron Meteorite / Recrystalized IIAB Hexahedrite
		UCLA has provisionally classified it as a recrystalized IIAB hexahedrite.
		The structure is consistent with recrystallization of a hexahedrite, with larger residual nuclei in the coarse patch.
	www.arizonaskiesmeteorites.com /AZ_Skies_Links/NWA_2678/index.html (462 words)

	[No title] (Site not responding. Last check: 2007-10-30)
		Tells that iron meteorites (a 6% minority of observed falls) are indeed commonly single crystals, or at least those irons with less than 7% Ni content are.
		This "kamacite" is called a "hexahedrite" for its cubic crystal habit.
		The parallel lines were first reported in 1848: "Neumann lines" of crystal twinning, presumably due to slippage planes during mechanical shock.
	eebweb.arizona.edu /faculty/Winfree/meteor.html (1211 words)

	IMPACTIKA: Meteorites
		Only one mass of 19.6 kilos was found in September 1998 in the Salta district of Argentina, and it was not recognized as a meteorite until 2003.
		Classified as a rare Hexahedrite, and rarely available to collectors.
		Very nice large slice with a jagged shock vein.
	www.impactika.com /Meteorities/Huaytiq.htm (46 words)

	Meteorite Classification Page
		A further subdivision of octahedrites is made based upon the width of the bands: fine, medium, coarse, and coarsest.
		Hexahedrite iron meteorites contain a relatively low amount of nickel (approximately 6% or less) and when etched with acid, show very thin lines called "Neumann lines" which have a hexahedral structure.
		Ataxite irons are the highest in nickel content (approximately 16% or more) and show no structure when etched with acid.
	imca.repetti.net /metinfo/metclass.html (837 words)

	CLASSIFICATION OF METEORITES
		Iron meteorites are characterized by the presence of two nickel-iron alloy metals: kamacite and taenite.
		Depending upon the percentage of nickel to iron, these subdivisions are classified as: hexahedrites, octahedrites and ataxites.
		Eisenmeteorite werden bestimmt nach dem Nickel-Eisengehalt und entsprechend als Hexahedrite, Okta-hedrite oder Ataxite bezeichnet.
	www.marmet-meteorites.com /id5.html (378 words)

	jyfalls
		Braunau, like many IIAB irons, is a hexahedrite.
		Hexahedrites are irons that consist almost entirely of one or more cubical crystals of the iron-rich mineral kamacite.
		When most people see a crystal of rock salt with six square sides or faces, they call it a cube.
	www1.broward.edu /~lhill/jlfalls.html (3125 words)

	The Astrodigital Online Dictionary of Meteoritics
		Irons are also categorized by their structural type.
		There are three structural categories: ataxite, hexahedrite and octahedrite.
		The bulk of the material in Iron meteorites is kamacite and taenite.
	www.astrodigital.org /astronomy/metdict.html (2090 words)

	Abstract 2001
		Conditions of epsomite, hexahedrite and kieserite formation as well as their transformations on the stage of katagenesis and hypergenesis have been determined on the base of geological, mineralogy-petrographic and physic-chemical investigations.
		Phase composition of epsomite transformation products under temperature about 50, 100, 150, 200, 250, 300 and 400°C was investigated with the help of X-ray analysis.
		During temperature increase as was ascertained dehydration of epsomite and gradual formation of hexahedrite, pentahedrite, tetrahedrite and probably three- and two-aqueous magnesium sulphates as well as kieserite took place.
	www.franko.lviv.ua /faculty/geology/English/Science/Mineralogy/Abstract-2001-II.htm (1651 words)

	Falling Stars: A Guide to Meteors and Meteorites (Astronomy) - zonExplorer (Site not responding. Last check: 2007-10-30)
		It gives a brief overview of meteors and comets, descriptions of the major meteor showers, major impact craters, and famous meterorite falls, as well as a breakdown of the various types of meteorites and tektites.
		It doesn't go into great detail on, say, the difference between an octahedrite, hexahedrite, and ataxite nickel-iron meteorite for example, but it does provide some sound info for the beginner.
		In addition to reading this great book, I have had the good fortune of meeting Dr. Reynolds in person.
	www.celtic-one-design.com /php/0811727556.htm (357 words)

	Universe Collection
		The second class, Hexahedrites, is made up of less than 6% nickel and contains kamacite but not taenite.
		When polished, a hexahedrite displays no surface features, but reveals "Neumann Lines" that are caused by impact shocks.
		The third class, Ataxites, are the finest of the iron meteorites.
	www.universecollection.com /what.asp (2552 words)

	Space Studies Board
		Evidence for such salts in the form of distorted water-absorption features in reflectance spectra has been obtained in some areas of Europa.
		This distortion has been interpreted as water of hydration, and it resembles that seen in laboratory spectra of the salts hexahedrite (MgSO
		O), and natron (Na Although materials present at depth within Europa are of great interest to the question of life, it is anticipated here that near-term studies of Europa will focus on the surface.
	www7.nationalacademies.org /ssb/comp-europach3.html (6244 words)

	[No title]
		Find- A found piece without associated witnessing of event
		Hexahedrite- Six-sided crystal structure found in nickel-iron meteorites
		Hypersthene- A silica mineral with associated iron content of between 20% and 30% (Mg,Fe)SiO3
	members.tripod.com /~mrd432/www/index3.html (935 words)

	The amazing creation of Earth and Iron - Iron came from space, and the Noble Quran mentioned it.
		The hexahedrites have a nickel content less than 7%.
		The hexahedrite nickel-iron is only the kamacite variety.
		The octahedrites having an overall nickel content between 6.5 and 18%.
	www.answering-christianity.com /earth.htm (7241 words)

	Space Studies Board
		The data from Galileo's Near-Infrared Mapping Spectrometer (NIMS) show that Europa's water-ice absorption features are distorted in comparison with those seen in pure ice.
		Many of Europa's dark regions exhibit spectral characteristics that appear distinct from those of water ice, and these have been interpreted as being consistent with the spectral characteristics of water-bearing salts such as hexahedrite (MgSO
		O), and natron (Na It is not yet known how plasma-bombardment damage may affect the near-infrared absorption features of water ice.
	www7.nationalacademies.org /ssb/comp-europach2.html (8004 words)

	Ingrid's Rockin' Dictionary
		An iron meteorite made almost entirely of taenite; the name means "without structure" and refers to the lack of a visible
		Widmanstätten pattern; spindles of kamacite only visible microscopically; designated D; most bulk content Ni ≥ 15%; [compare octahedrite; hexahedrite]
		An iron meteorite composed of taenite and kamacite, named for the octahedral (eight sided) shape of the kamacite crystal growth; show Widmanstätten pattern; further divided by width of kamacite lamellae; [PM 4-6] [compare hexahedrite; ataxite]
	www.lpl.arizona.edu /~ingrid/dictionary.html (6780 words)

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