achondrite


achondrite
achondritic /ay'kon drit"ik/, adj.
/ay kon"druyt/, n.
a meteorite containing no chondrules.
[1900-05; A-6 + CHONDRITE]

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 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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Universalium. 2010.

Look at other dictionaries:

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  • achondrite — n. 1. a stony meteor lacking chondrules. [WordNet 1.5] …   The Collaborative International Dictionary of English

  • achondrite — [ā kän′drīt΄] n. [ A 2 + CHONDRITE] the type of stony meteorite that contains no chondrules achondritic [ā kän′drit′ik] adj …   English World dictionary

  • Achondrite — An achondrite is a stony meteorite that consists 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… …   Wikipedia

  • achondrite — noun Date: circa 1904 a stony meteorite without rounded grains • achondritic adjective …   New Collegiate Dictionary

  • achondrite — noun Any stony meteorite that contains no chondrules …   Wiktionary

  • achondrite — [ə kɒndrʌɪt] noun a stony meteorite containing no small mineral granules (chondrules) …   English new terms dictionary

  • achondrite — achon·drite …   English syllables

  • achondrite — a•chon•drite [[t]eɪˈkɒn draɪt[/t]] n. astron. a meteorite containing no chondrules • Etymology: 1900–05 a chon•drit′ic ˈdrɪt ɪk adj …   From formal English to slang

  • Achondrite —    A coarsely crystallized stony meteorite containing fragments of various minerals that are large enough to be seen by the naked eye …   The writer's dictionary of science fiction, fantasy, horror and mythology


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