Météorite pallasite

Météorite pallasite

Nommées en l'honneur du naturaliste allemand Pallas.

Elles sont composées de cristaux d'olivine automorphe ou xénomorphe, inclus dans une matrice de ferro-nickel où l'on retrouve souvent les figures de Widmanstätten (densité : de 4,5 à 7).

Sciées et polies, elles deviennent très esthétiques et prennent une grande valeur marchande du fait de leur rareté (1 % des chutes de météorites).

Cliquez sur une vignette pour l’agrandir

Wikimedia Foundation. 2010.

Contenu soumis à la licence CC-BY-SA. Source : Article Météorite pallasite de Wikipédia en français (auteurs)

Игры ⚽ Нужен реферат?

Regardez d'autres dictionnaires:

  • Pallasite — Météorite pallasite Nommé en l honneur du naturaliste allemand Pallas. Elles sont composées de cristaux d olivine automorphe ou xénomorphe, inclus dans une matrice de ferro nickel où l on retrouve souvent les figures de Widmanstätten… …   Wikipédia en Français

  • Meteorite Men — Meteorite hunters Steve Arnold and Geoff Notkin. Genre Documentary / Reality Presented by …   Wikipedia

  • Meteorite fall statistics — are frequently used by planetary scientists to approximate the true flux of meteorites on the Earth. Meteorite falls are those meteorites that are collected after being witnessed to fall, whereas meteorite finds are discovered at a later time.… …   Wikipedia

  • Pallasite — A slice of the Esquel pallasite, clearly showing the large olivine crystals suspended in the metal matrix. A pallasite is a type of stony–iron meteorite. Contents 1 Structure and compositi …   Wikipedia

  • Krasnojarsk (meteorite) — Meteorite Name= Krasnojarsk Image caption= Hand colored drawing Image width= Type= Stony iron Class= Pallasite Group= Pallasite Main Group Structural classification= Medium octahedrite Composition= Shock= Weathering= Country= Russia Region=… …   Wikipedia

  • 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

  • Seymchan (meteorite) — Meteorite Name= Seymchan Image caption= An olivine free portion of Seymchan Image width= Type= Stony iron Class= Pallasite Group= Main Group Pallasite Structural classification= Coarse octahedrite Composition= 9.15% Ni, 24.6 ppm Ga, 68.3 ppm Ge,… …   Wikipedia

  • Brahin (meteorite) — Meteorite Name= Brahin Image caption= A small Brahin slice Image width= Type= Stony iron Class= Pallasite Group= Main Group Pallasite Structural classification= Medium octahedrite Composition= 37.18 wt% olivine metal: 91% Fe, 8.38% Ni crystals 36 …   Wikipedia

  • Meteorite — This article is about debris from space that survives impact with the ground. For other uses of Meteor and Meteors , see Meteor (disambiguation). For popular applications, see Falling star. For the fictional superhero in the Marvel Comics… …   Wikipedia

  • Meteorite classification — The ultimate goal of meteorite classification is to group all meteorite specimens that share a common origin on a single, identifiable parent body. This could be a planet, asteroid, Moon, or other current Solar System object, or one that existed… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”