achondrite


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achondrite

(ay-kon -drÿt) Any of a class of stony meteorites that lack the characteristic chondrules of the chondrites. They are usually more coarsely crystallized than the chondritic stones and are more similar chemically and mineralogically to some terrestrial rocks. They contain very little iron and nickel. Achondrites resemble volcanic rocks and are thought to be products of large-scale melting on their parent bodies, i.e. they are differentiated or reprocessed matter. See also HED meteorites; SNC meteorites.

achondrite

[¦ā′kän‚drīt]
(geology)
A stony meteorite that contains no chondrules.
References in periodicals archive ?
Not surprisingly, extremely rare lunar and Martian achondrites can sell for thousands of dollars per gram.
Achondrites (which lack chondrules) are prized by scientists and collectors alike because they come from the Moon, Mars, the asteroid Vesta, and other geologically differentiated bodies.
Achondrites are usually the most expensive because of their rarity and place of origin.
Basaltic achondrites lack the rounded particles, or chondrules, found inside most stony meteorites.
Consider the meteorite class called basaltic achondrites, which make up about 6 percent of all meteorites recovered on Earth and which formed from once-molten material that originated on or under the surface of a small body.
Only one known asteroid, 4 Vesta, has a surface composition similar to that of basaltic achondrites, researchers showed in the 1970s.
That mineral also predominates in a group of meteorites called enstatite achondrites.