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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.
A stony meteorite that contains no chondrules.