achondrite

achondrite

[ey-kon-drahyt]
noun
a meteorite containing no chondrules.

Origin:
1900–05; a-6 + chondrite

achondritic [ey-kon-drit-ik] , adjective
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Collins
World English Dictionary
achondrite (eɪˈkɒndraɪt)
 
n
Compare chondrite a rare stony meteorite that consists mainly of silicate minerals and has the texture of igneous rock but contains no chondrules
 
achondritic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
achondrite   (ā-kŏn'drīt')  Pronunciation Key 
A stony meteorite that does not contain chondrules.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

achondrite

any stony meteorite containing no chondrules (small, roughly spherical objects that formed in the solar nebula). The only exclusions are carbonaceous chondrites of the CI group, which, though they are clearly chondrites, are so heavily altered by water that any evidence for their having contained chondrules is lost. Achondrites, constituting about 4 percent of the known meteorites, are similar in appearance to terrestrial igneous rocks that have a low silica content, such as basalts, peridotites, and pyroxenites. Most formed by various melting and crystallization processes within asteroids. The majority of achondrites belong to one of the following groups: acapulcoites, angrites, aubrites, chassignites, diogenites, eucrites, howardites, lodranites, nakhlites, shergottites, and ureilites. The shergottites, nakhlites, and chassignites almost certainly came from Mars. In addition, a small group of achondrites are believed to be derived from the Moon

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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