chondrite


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Related to chondrite: Carbonaceous chondrite

chondrite:

see meteoritemeteorite,
meteor that survives the intense heat of atmospheric friction and reaches the earth's surface. Because of the destructive effects of this friction, only the very largest meteors become meteorites.
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chondrite

(kon -drÿt) A type of stony meteorite that contains chondrules. They are the most abundant class of meteorite in the Solar System (about 86%). Chondrites are largely composed of iron- and magnesium-bearing silicate minerals with a wide range of compositions. Their chemical composition is similar to that of the Sun (but depleted in volatile gases like hydrogen and helium). Several types are recognized: carbonaceous chondrites have the highest proportions of volatile elements and are the most oxidized; enstatite chondrites contain the most refractory elements (withstanding high temperatures) and are reduced; ‘ordinary’ chondrites, the most common type, are intermediate in volatile element abundance and oxidation state. Ordinary chondrites plus some carbonaceous chondrites are thought to be primitive samples of early Solar-System material. See also asteroids. Compare achondrite.

Chondrite

 

the most common type of stony meteorite, accounting for 90 percent of all such meteorites. Chondrites are characterized by the presence of chondrules located in the primary, fine-grained mass of the meteorite (see). They contain a significant amount of nickel-bearing iron in the form of small grains that have the same composition and microstructure as the grains in octahedrites.

chondrite

[′kän‚drīt]
(geology)
A stony meteorite containing chondrules.
References in periodicals archive ?
Our study makes us even more convinced than before that the early carbonaceous chondrite rocks were shaped by the turbulent nebula through which they travelled billions of years ago, in much the same way that pebbles in a river are altered when subjected to high turbulence in the water.
The meteorite belongs to a class known as carbonaceous chondrites, which make up only 2 percent of the rocks that fall to Earth and rank among the most primitive bodies in the solar system.
Monahans 1998 belongs to a class of meteorites known as ordinary chondrites, which astronomers have believed are fragments of asteroids that contain little or no water.
The rocks are carbonrich chondrites, ancient fragments of asteroids formed shortly after the birth of the Solar System 5bn years ago.
Our dust samples similarly show a subtle tendency towards relative Zr loss, with an average Zr/Hf slightly lower than chondrite (32.
The Tagish Lake fragments are from a carbonaceous chondrite, a rare class of ancient meteorite that contains water-altered minerals and organic compounds.
It was likely a chondrite, a meteoric stone older than the planets and rare enough that a UCLA scientist has offered a $5,000 reward for any fragment weighing at least 4 ounces.
Honorary mention goes to Matt Izawa from the University of Western Ontario, advised by Associate Professors Penelope King and Roberta Flemming on his research on "Investigation of the Tagish Lake Carbonaceous Chondrite Using X-ray Microdiffraction.
The standardization based on chondrite, which reflects the differentiation degree of the sample and characteristics of the source region in comparison with pristine terrestrial materials, is one of the approaches to the study of the distribution pattern of REEs in shale sediment.
The studied rocks, which are normalized according to chondrite and primitive mantle, are illustrated in figures 6.