chondrite

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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 ?
The final goal of the present proposal is to determine if Earth and other planets are chondritic or not, and to understand the implications of their refined starting composition on their geological evolution in terms of early planetary differentiation.
That's very strong evidence that Earth has a chondritic magnesium composition," Teng said.
The scientists believe that the crater -- roughly 100 micrometers in diameter -- formed when a chondritic micrometeoroid struck the craft at high velocity, leaving a dent in an aluminum panel near its leading edge.
In addition, ground-based near-infrared spectra acquired in early January 2005 by Andrew Rivkin (Applied Physics Laboratory) and Richard Binzel (MIT) suggested that the asteroid's composition was like that of a common, ordinary chondritic meteorite.
The patterns for all of the granite samples are similar, and show moderate enrichment in the light REE, a large negative Eu anomaly, and a flat heavy REE at 20 to 40 times chondritic values (Fig.
First, their elemental makeup is similar to that of chondritic mateorites, which contain mostly silicon, magnesium, iron, and aluminum.
The eruptives from MgO-rich (~16%) parental picritic magma (Krishnamurthy and Cox, 1977) would yield higher platinum group element (PGE) concentrations than typical Deccan basalts and their Cr/Ni ratios are closer to those in the Spanish Caravaca K-T layer than to chondritic ratios (Vannucci et al.
Even Apollo lunar samples showed that the Moon--which has no atmosphere with which to sustain water or life--has some simple organic molecules deposited by carbonaceous chondritic meteorites.
REE concentrations are low and, relative to chondritic values, show slight light REE enrichment (Fig.
20 NATURE, "we have found a suprisingly high abundance of unmelted chondritic fragments.
Another important discovery made at the Gredero section, is the chondritic abundance ratios of all the platinum group elements (PGE) (Kyte et al.
Chondritic meteorites come in many varieties, including ordinary chondrites (comprising about 85 percent or more of falls), carbonaceous chondrites, enstatite chondrites, and rumuruti chondrites.