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Stony meteorite that does not contain chondrules
- 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.
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An achondrite is a stony meteorite that does not contain chondrules. [2] [3] 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.
The meteorite, classified as a diogenite, contains large orthopyroxene grains in a matrix of crushed and broken (brecciated) orthopyroxene. (more) Achondrite s, their name meaning “without chondrites,” are a relatively small but diverse group of meteorites. They exhibit a range of features that would be expected if their parent bodies ...
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
Because achondrites closely resemble terrestrial rocks to the naked eye, they are less commmonly encountered as finds. The achondrites include. lunar meteorites; martian meteorites; HED meteorites; primitive achondrites; For detailed information on achondrites and their classification, click here.
Achondrite meteorites are stony meteorites lacking chondritic texture; that is, they lack the spherical chondrules that are the defining characteristic of chondrites. As originally defined in the Rose—Tschermak—Brezina classification system, achondrites were also distinct from chondritic meteorites in composition.
Achondrites are made of the same minerals as terrestrial rocks. The igneous (mostly basaltic) achondrites (some eucrites, some diogenites, some lunar, and most martian) look just like their terrestrial counterparts. They are all formed by the same processes.
They are a mechanical mixture of components that formed in the solar nebula or even earlier. Perhaps more remarkably, the compositions of chondrites are very similar to that of the Sun, except for the absence (in chondrites) of very volatile elements such as hydrogen and helium. The Sun contains more than 99 percent of the mass of the solar system.
