An achondrite[1] 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. [4][5] As a result, achondrites have distinct ...

Achondrites lack chondrules, originate on differentiated planetary bodies (ie planetary bodies with a distinct core and crust), such as asteroids, planets, or moons, and were reformed from molten fragments that were flung into space as the result of another collision.

2025年1月18日 · Most achondrites collected on Earth are derived from asteroids, but one small group is thought to come from Mars and another from the Moon. The three most numerous asteroidal achondrite groups are the aubrites, the howardite-eucrite-diogenite association,

achondrite, any stony meteorite containing no chondrules (small, roughly spherical objects that formed in the solar nebula). The only exclusions are carbonaceous chondrite s of the CI group, which, though they are clearly chondrite s, are so heavily altered by water that any evidence for their having contained chondrules is lost.

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.

无球粒陨石（Achondrite）是由岩浆结晶的不含球粒（宇宙源的球状体）的石陨石，约占已知陨石的4%，外观上与玄武岩、橄榄岩和辉岩等含硅量低的地球火成岩相似。

Primitive achondrites are a subdivision of meteorites. They are classified on the same rank (historically called "Class") and lying between chondrites and achondrites. They are called primitive because they are achondrites that have retained …

History: The stone was found by meteorite hunters in Western Sahara. Physical characteristics: Smooth sand blasted exterior and saw-cut, exposed interior show a cumulate intermingling of cream-colored plagioclase grains and vivid-green pyroxene grains.

An achondrite is defined as a type of meteorite that can be categorized into two main groups: differentiated achondrites and primitive achondrites. Differentiated achondrites exhibit igneous textures and highly fractionated compositions, while primitive achondrites show equilibrated, metamorphic textures with compositions less distinct from ...

An achondrite is a stony meteorite that deviates from its chondritic counterparts, lacking the distinctive chondrules. These meteorites showcase textures and mineralogies indicative of intense igneous processes, resulting from significant melting …