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Topic: Achondrite

	Achondrite - Encyclopedia, History, Geography and Biography
		An achondrite is a stony meteorite that is made of material similar to terrestrial basalts or plutonic rocks.
		Compared to the chondrites, they have all been differentiated and reprocessed to a lesser or greater degree due to melting and recrystallization on or within meteorite parent bodies.
		Achondrites account for about 8% of meteorites overall, and the majority (about two thirds) of them are HED meteorites, originating from the crust of asteroid 4 Vesta.
	www.arikah.net /encyclopedia/Achondrite (162 words)

	achondrite
		Most achondrites are chemically similar to basalts and are thought to be the product of melting on large asteroids, moons, and planets.
		Although the majority of achondrites are of asteroidal origin, some are known to have come from the highland regions of the Moon’s farside (see lunar meteorites) and from Mars (see Mars meteorites).
		As well as the evolved achondrites, there is an entire group of primitive achondrites whose members all seem to have derived from small chondritic parent bodies that only partially melted and differentiated through accretion processes or from impact events, and then rapidly cooled.
	www.daviddarling.info /encyclopedia/A/achon.html (465 words)

	Meteoroids and Meteorites
		One of the primary goals of studying meteorites is to determine the history and origin of their parent bodies.
		Several achondrites sampled from Antarctica since 1981 have conclusively been shown to have originated from the moon based on compositional matches of lunar rocks obtained by the Apollo missions of 1969-1972.
		Achondrites are also stony meteorites, but they are considered differentiated or reprocessed matter.
	www.solarviews.com /eng/meteor.htm (1526 words)

	Achondrite - Wikipedia, the free encyclopedia
		An Achondrite is a stony meteorite that is made of material similar to terrestrial basalts or plutonic rocks.
		Compared to the chondrites, they have all been differentiated and reprocessed to a lesser or greater degree due to melting and recrystallization on or within meteorite parent bodies.
		Achodrites account for about 8% of meteorites overall, and the majority (about two thirds) of them are HED meteorites, originating from the crust of asteroid 4 Vesta.
	en.wikipedia.org /wiki/Achondrite (161 words)

	[meteorite-list] Equilibration vs Differentation (Site not responding. Last check: 2007-10-20)
		the achondrites are from asteroids/planets that have melted, and hence are distinguished by a 'crystalline' texture - minerals that grow from a melt in an interlocking network.
		Perhaps chondrite to achondrite evolution is likened to the fossil record.
		Achondrites which are non-planetary(SNC,L) generally fall into four or so classes with ungrouped samples mixed around and in between: 1)Basaltic: Eucrites Dioginites (Howardites being the combination)Angrites.
	six.pairlist.net /pipermail/meteorite-list/2003-May/130088.html (867 words)

	Meteoroids and Meteorites
		One of the primary goals of studying meteorites is to determine the history and origin of their parent bodies.
		Several achondrites sampled from Antarctica since 1981 have conclusively been shown to have originated from the moon based on compositional matches of lunar rocks obtained by the Apollo missions of 1969-1972.
		Achondrites are also stony meteorites, but they are considered differentiated or reprocessed matter.
	www.solarviews.org /eng/meteor.htm (1526 words)

	* Achondrite - (Astronomy): Definition
		Discovered at Reckling Peak, Antarctica, this type of meteorite is known as an achondrite.
		Achondrite: A class of stony meteorites that crystallized from magmas.
		Stony meteorites are further classified as chondrites, achondrites, or carbonaceous chondrites based on their carbon content and texture.
	en.mimi.hu /astronomy/achondrite.html (191 words)

	Achondrite - Biocrawler (Site not responding. Last check: 2007-10-20)
		An Achondrite is a stony meteorite that is made of material similar to terrestrial basalts.
		They are formed by the melting and recrystallization on or within meteorite parent bodies; as a result, achondrites have distinct textures and mineralogies indicative of igneous processes.
		They are believed to have originated on the Moon and/or Mars.
	www.biocrawler.com /encyclopedia/Achondrite (79 words)

	[No title]
		Achondrite meteorites are very similar in appearance to terrestrial igneous rocks.
		There are over a dozen different sub-classifications of achondrites, but many of them have only one or two specimens associated with them.
		Because achondrites are igneous in nature they are believed to have formed on differentiated bodies in the solar system.
	www.meteorlab.com /METEORLAB2001dev/achonds.htm (708 words)

	Achondrite Meteorites for Sale
		Achondrites are formed by igneous processes on or near the surface of larger asteroids or planets.
		These are achondrites that originate in the asteroid belt as opposed to on the moon or Mars.
		A third kind of achondrite would be a rock (like a chondrite) that was simply melted and cooled.
	www.alaska.net /~meteor/achon.htm (406 words)

	Achondrite
		Achondrite sind also Muster anderer differenzierter Welten und ähneln insofern irdischen Gesteinen.
		Dennoch sind die meisten Achondrite recht primitiv - d.h.
		Nur wenige Achondrite stammen nachweislich von grösseren Mutterkörpern, was sich auch in einem wesentlich jüngeren Entstehungsalter ausdrückt.
	www.signature.de /webrefs/e-meteorite/deutsch/d33_achondrite.htm (239 words)

	Achondrite Meteorites
		This is a basaltic type rock and is the region where the achondrite meteorites originate.
		They are frequently referred to as achondrites, (without chondrules.) There are other achondrites recognized as well.
		Urelites are the only achondrites found to contain significant free metal.
	www.manzanitalab.com /store.php?crn=199 (316 words)

	۞ Achondrite - Encyclopédie, information et définition sur www.apropos-savoir.fr (Site not responding. Last check: 2007-10-20)
		Achondrite est un terme utilisé en astronomie pour désigner un certain type de météorite pierreuse (moins de 35% de métal).
		Les achondrites sont des météorites différenciées qui proviennent de la surface de gros astéroïdes.
		Les achondrites sont similaires aux chondrites ordinaires mais elles sont plus riches en calcium et moins en métaux.
	www.apropos-savoir.fr /Achondrite (461 words)

	Te-1 PHOTO
		This primitive achondrite has a chemical and mineral composition unlike that of any other meteorite.
		It has an O-isotopic composition distinct from any other achondrite group, plotting within the CR-field, and interestingly, very near to that of the ungrouped basaltic meteorite NWA 011.
		These varied characteristics are most consistent with the grouping of Te-1 as a brachinite-like primitive achondrite, but continued research may reveal an alternate history for this meteorite.
	www.meteoritestudies.com /protected_TENERE.HTM (324 words)

	Dhofar 732 / Ungrouped Achondrite
		A small brownish stone weighing 17 g was found in the Dhofar region of Oman.
		Specimens: type specimens of 3.5 g, and a thin section, Vernad; main mass with anonymous finder.
		A part slice of a unique achondrite classified orthopyroxenite, many small vugs are weel visible.
	www.meteorites.tv /contents/en-us/d236.html (73 words)

	Langs Meteorites: Learn About Meteorites
		We report here on a new achondrite which was found in 1999 very close to the site of Zag and which we call Zag (b) hereafter.
		Olivine, the dominant mineral in Zag (b), Divnoe, and Brachina, varies from the Fo80 of Zag (b) through Fo74 in Divnoe, to Fo70 in Brachina.If these achondrites were related by conventional magmatic processes, Zag (b) should be the most primitive meteorite while Brachina is the most evolved.
		Since at least two distinct petrographic subclusters exist within this group of primitive achondrites, it is unlikely that the redox exchange occurred within a single parent and the variations seen represent variable nebular modification of a common chondritic precursor to all of these meteorite types.
	www.nyrockman.com /science/zag-b.htm (961 words)

	Encyclopedia article on Meteorite [EncycloZine] (Site not responding. Last check: 2007-10-20)
		The isotope ratios of carbonaceous chondrites are similar to those of the Sun.
		Achondrites are similar to terrestrial mafic igneous rocks and sometimes are brecciated.
		Achondrites constitute about 8% of the incoming material and are thought to represent crustal material of larger asteroids.
	encyclozine.com /Meteors (689 words)

	Stannern achondrite meteorite - Virtual Wonders at The Natural History Museum
		This is a melted stony meteorite, or achondrite (sub-group: eucrite).
		It is part of the Stannern meteorite shower that fell in Moravia in May 1808.
		Stannern is one of a group of meteorites that is thought to come from the asteroid 4 Vesta.
	www.nhm.ac.uk /nature-online/virtual-wonders/vrmeteorite2.html (91 words)

	achondrite \| \| Dictionary & Translation by Babylon
		Als Achondrite werden alle Steinmeteorite klassifiziert, die keine Chondrite sind.
		Sie sind mit lediglich drei Prozent Anteil an der Gesamtzahl aller Meteorite recht selten, was vermutlich darauf zurückzuführen ist, dass die meisten Achondrite bei terrestrischer Verwitterung innerhalb kürzester Zeit kaum mehr von irdischen Gesteinen unterschieden werden können.
		Achondrite est un terme utilisé en astronomie pour désigner un certain type de météorite pierreuse (moins de 35 e métal).
	www.babylon.com /definition/achondrite/All (248 words)

	PAC-Gruppe, Acapulcoite, Lodranite, Brachinite, Winonaite, Zaklodzie
		Das Kürzel "PAC" steht für "primitive Achondrite" und umfasst verschiedene Gruppen von Meteoriten, die ihren chondritischen Vorläufern in Chemismus und Struktur recht ähnlich sind.
		Der Meteorit Winona wurde 1928 bei archäologischen Grabungen in dem prähistorischen Elden-Pueblo, Arizona, in einer in den Stein gemeisselten Wandnische entdeckt.
		Beispiele hierfür sind zwei unlängst gefundene, enstatitreiche Achondrite: Zaklodzie aus Polen und ITQIY aus Nordafrika.
	www.signature.de /webrefs/e-meteorite/deutsch/d33_pacgruppe.htm (577 words)

	Meteorite Thin Sections
		These images represent "text-book" examples of textures and other identifying characteristics used in the petrographic classification of meteorites and will be helpful to any serious students of meteorite petrology.
		Acopulcoites are primitive achondrites with a fine-grained mineralogy of approximately chondritic abundances -- olivine, pyroxene, plagioclase, metal, and troilite.
		From a mineralogical perspective, Aubrites, of all the achondrites, may be the most fascinating.
	www.meteorlab.com /METEORLAB2001dev/tsections.htm (335 words)

	PSRD: Portales Valley meteorite
		The primitive achondrites are believed to have been heated solely or primarily by internal heating.
		On the other hand, as with primitive achondrites and iron meteorites, there is clear evidence that portions of Portales Valley melted, probably by an internal heating mechanism unrelated to shock.
		Portales Valley is transitional between primitive (chondrite) and evolved (achondrite and iron) meteorites.
	www.psrd.hawaii.edu /Sept05/PortalesValley.html (3228 words)

	Northwest Africa 1463, a Primitive Achondrite with Chondrules [six linked files, 408 kb]
		Both these classes of stony meteorite are notable in being "primitive achondrites", representing one or more chondritic parent bodies in their earliest stages of melting and igneous differentiation.
		The primitive achondrites are as interesting as they are rare: in the summer of 2002, a literature search uncovered just 15 acapulcoites, 14 lodranites and 11 winonaites.
		Wilson,GC (19 July 2002) Mineralogy, chemistry, classification and pairing of a 1-kg trove of the primitive achondrite Northwest Africa 725.
	www.turnstone.ca /nwa1463.htm (1025 words)

	Angrite / Sahara 99555 (Site not responding. Last check: 2007-10-20)
		Angrite is a unique basaltic achondrite whose mineralogy is distinct from other achondrites.
		These achondrites consisting predominantly of Ca-AI-Ti- rich pyroxene, Ca-rich olivine, and anorthitic plagioclase (e.g., McK.ay et al., 1988).
		Longhi (1998) has argued that their precursor material must have been extremely CAI-rich and that no known chondritic precursors exactiy make up a satisfactory starting material for these achondrites.
	www.lunar-meteorite.com /contents/en-us/d70.html (178 words)

	achondrite - What is definition of the term - achondrite ? (Site not responding. Last check: 2007-10-20)
		=> achondrite -- (a stony meteor lacking chondrules)
		Achodrites account for about 8% of meteorites overall, and the majority (about two thirds) of them are HED meteorites, originating from the crust of asteroid 4 Vesta.
		Achondrites are classified into the following groups: * Primitive achondrites (PAC group) Acapulcoites Lodranites Brachinites Winonaites ** Ureilites * HED (Vesta) meteorites Howardites Eucrites ** Diogenites * Lunar meteorites * Martian (SNC) meteorites * Other Evolved achondrites Angrites Aubrites *http://www.meteorite.fr/en/classification/stonymain.htm de:Achondrit fr:Achondrite pl:Achondryt fi:Akondriitti
	www.linguasphere.org /dictionary/n-517-achondrite.html (546 words)

	Unusual Meteorite Features (Ibitira with Vesicles) - Meteorites Australia
		The Ibitira meteorite fell at 5:15pm local time on June 30th, 1957 near the village of Ibitira in Martinho Campos county, Minas Gerais, Brazil.
		However, it is thought that Ibitira represents a fifth and distinctly different parent-body to other known basaltic eucrites from the HED/O (Vesta 4) group.
		Ibitira: A basaltic achondrite from a distinct parent asteroid and implications for the Dawn mission.
	www.meteorites.com.au /features/ibitira.html (455 words)

	Angrite / Sahara 99555
		Angrite is a unique basaltic achondrite whose mineralogy is distinct from other achondrites.
		These achondrites consisting predominantly of Ca-AI-Ti- rich pyroxene, Ca-rich olivine, and anorthitic plagioclase (e.g., McK.ay et al., 1988).
		Longhi (1998) has argued that their precursor material must have been extremely CAI-rich and that no known chondritic precursors exactiy make up a satisfactory starting material for these achondrites.
	www.lunar-meteorites.com /en-us/dept_70.html (289 words)

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