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An achondrite is a stony meteorite that does not contain chondrules. It consists of material similar to terrestrial basalts or plutonic rocks and has been differentiated and reprocessed to a lesser or greater degree due to melting and recrystallization on or within meteorite parent bodies.
Chondrites are physically and chemically the most primitive meteorites in the solar system. They appear to be primarily aggregates of material that formed in the solar nebula prior to or during planet formation. They also contain some material that predates formation of the solar system.
- The Editors of Encyclopaedia Britannica
1.6.5 Summary. Achondrites as a whole show one curious property when compared with the total range of meteorite types – chondrites, achondrites, stony irons, and irons. Many of the achondrite types occupy a very limited range of oxygen-isotopic compositions (Clayton and Mayeda, 1996; Greenwood et al., 2005; Wiechert et al., 2004 ), yet ...
History: The meteorite was purchased from a local meteorite dealer in Niger. Physical characteristics: Dark brownish rock without fusion crust. Petrography: The meteorite is an enstatite achondrite predominantly composed of 50-1000 µm sized enstatite and less abundant sodic feldspar grains.
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Mar 3, 2017 · Achondrites are meteorites that formed by varying degrees of melting and differentiation on their parent bodies. They are divided into asteroidal and planetary achondrites. Asteroidal achondrites are remnants of differentiated planetesimals and protoplanets that existed shortly after the formation of the Solar System.
Home Science Astronomy. Achondrites. Johnstown meteorite. Sawed and polished section of a fragment of the Johnstown meteorite, an achondrite that was seen to fall July 6, 1924, in Colorado. The meteorite, classified as a diogenite, contains large orthopyroxene grains in a matrix of crushed and broken (brecciated) orthopyroxene. (more)
