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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.
A chondrite / ˈkɒndraɪt / is a stony (non- metallic) meteorite that has not been modified, by either melting or differentiation of the parent body. [a] [1] They are formed when various types of dust and small grains in the early Solar System accreted to form primitive asteroids.
- Small to medium asteroids that were never part of a body large enough to undergo melting and planetary differentiation.
- Over 27,000
- 3–6
- Stony
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.
- The Editors of Encyclopaedia Britannica
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)
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The achondrites include. lunar meteorites. martian meteorites. HED meteorites. primitive achondrites. For detailed information on achondrites and their classification, click here. Click on the images below to learn about some of the achondrites in the ASU Center for Meteorite Studies collection!
Achondrite They are achondrites that exhibit igneous textures or igneous textures modified by impact and/or thermal metamorphism, and that have compositions of lithophile, siderophile, chalcophile, and atmophile elements that are highly fractionated from the ranges of chondritic materials.
