Texture N°1 - Chassignite

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Texture N°1 - Chassignite

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Texture N°1 - Chassignite

La particularité de cette météorite est quelle est un mélange de roche noire, blanche et rosée, ressemblant à la NWA2737, type Chassignite

Remerciements at The Meteoritical Society (cf lien)

https://www.lpi.usra.edu/meteor/metbull.php?code=32480007

         

Texture N°1-2 meteorite chizé de mars    Texture comparative N1-2 meteorite chizé de mars

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NWA 8694 Chassignite For Sale
NWA 8694 CHASSIGNITE FOR SALE

The NWA 8694 Chassignite is for sale from the source! I acquired in 2014 a little 54.8 g stone that turn to be the third martian meteorite of this type. The Chassigny meteorite, the type name, fell in Chassigny, Haute Marne, France, on 3 October 1815.

Petrography and classification: (Roger Hewins, Sylvain Pont, Brigitte Zanda, MNHNP) This meteorite is a cumulate dunite with 85% highly fractured olivine, classified as a chassignite.
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                     texture comparative Texture n°1

Comparative texture with the NWA2737 et la météorite-mars Chizé nouvelle aquitaine.

nwa2737a.JPG, nwa2737b.JPG

This is a partial endcut with the back side represented in the first photo.. It weighs 7.02 grams and measures 31.7 mm by 21.4 mm by 8.8 mm thick. All measurements taken at widest point.


From The Meteoritical Bulletin No. 90

Northwest Africa 2737

Found in 2000 in Morocco

Martian meteorite (chassignite)

History: In August 2000, meteorite collectors discovered a stone fragmented into nine pieces (308 g, 128 g, 74 g, 47 g, 38 g, 6.4 g, 3.3 g, 2.0 g, and 4.3 g for a total mass of 611 g) in the western part of the Sahara. Petrography and Geochemistry: (P. Beck, Ph. Gillet, B. Reynard, B. van de Moortele, ENSL; J.A. Barrat, M. Bohn, I. Cotton, UBO) Olivine (Fo78.2–79.1; Mn/Fe = 0.018; ~89.6 vol%), chromite (4.6 vol%), low-Ca pyroxene (En78.5Wo2.7Fs18.8 to En76.6Wo3.2Fs20.2), high-Ca pyroxenes (En73.5Wo8.0Fs18.5 to En64.0Wo22.1Fs13.9; Mn/Fe 0.030 [total of low- and high-Ca pyroxene ~4.1 vol%]), and sanidine glass (~1.6 vol%) with traces of apatite. The texture is that of a cumulate dominated by mm-size anhedral to subhedral olivine crystals, sometimes poikilitically enclosed in augite (En54.6Wo32.8Fs12.6 to En46.7Wo44.1Fs9.2). Oxygen isotopes: (I. Franchi, R. Greenwood, OU) d17O = 2.40, d18O = 4.02, ?17O = 0.315; d17O = 2.30, d18O = 3.85, ?17O = 0.295 (all ‰, n = 2). Furthermore, NWA 2737 displays trace element abundances similar to Chassigny. For example, its REE pattern resembles that of Chassigny but with a more pronounced LREE enrichment.



En bas a droite texture Meteorite Chizé de Mars qui correspond a la Metéorite NWA 2737 Martian meteorite (chassignite)

Martian texture NWA 2737, texture comparative texture N°1

Vidéo de toutes les textures de la météorite Chizé de Mars Nouvelle Aquitaine