Eucrite
- Eucrite
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GRA98033 une eucrite
Brèche d'environ 5
cm de long, trouvée en Antarctique
Les Eucrites sont des roches de type achondrite d'origine météoritique, la plupart proviendraient de l'astéroïde Vesta et font partie du groupe météorite HED. Ce sont les achondrites les plus courantes, environ 100 spécimens ont été trouvés à ce jour.
Ce sont des roches basaltiques. Elles sont composées principalement de pyroxène pauvre en calcium, de pigeonite et de plagioclase riche en calcium.
Etymologie
Le nom "Eucrite" vient du grec ancien eukritos signifiant "facilement distingable".
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eucrite — [yo͞o′krīt΄] n. a class of rare achondritic meteorite composed of basalt and believed to have been formed in lava flows on either the moon, Mars, or an asteroid eucritic [yo͞o krit′ik] adj … English World dictionary
Eucrite — Eucrites are achondritic stony meteorites that originate from the surface of the asteroid 4 Vesta, and as such are part of the HED meteorite group. They are the most common achondrite group with well over 100 distinct finds at present.Eucrites… … Wikipedia
eucrite — noun Etymology: German Eukrit, from Greek eukritos easily discerned, from eu + kritos separated, from krinein to separate more at certain Date: 1881 1. a stony meteorite composed essentially of plagioclase and pigeonite 2. a rock consisting of a… … New Collegiate Dictionary
eucrite — /yooh kruyt/, n. Petrog. a basic gabbro consisting mainly of bytownite and augite. [1895 1900; < G Eukrit < Gk eúkritos readily chosen, equiv. to eu EU + kritós separated (verbid of krínein)] * * * ▪ mineral rock that contains 30 to 35… … Universalium
eucrite — noun An achondritic meteoritic rock consisting chiefly of pigeonite and anorthite … Wiktionary
eucrite — eu·crite … English syllables
eucrite — ˈyüˌkrīt noun ( s) Etymology: German eukrit, from Greek eukritos easily discerned, from eu + kritos separated, chosen, from krinein to separate more at certain 1. : a meteorite composed essentially of anorthite and augite 2. : a very basic gabbro … Useful english dictionary
Eucrite Meteorite — A class of basaltic meteorite believed to have come from the asteroid 4 Vesta … The writer's dictionary of science fiction, fantasy, horror and mythology
Meteorite fall — Witnessed Bolide Meteorite falls, also called observed falls, are those meteorites that were witnessed by people or automated devices as they moved through the atmosphere or hit the Earth, and were subsequently collected. All other meteorites are … Wikipedia
Liste de chutes météoriques observées — Cet article recense la liste par ordre alphabétique des chutes météoriques observées et bien documentées. Les météorites sont des objets extraterrestres qui atteignent la surface de la Terre et qui ne sont pas exterminés à cet impact… … Wikipédia en Français