| en bas a droite ref texture Northwest Africa 2737 Basic information Name: Northwest Africa 2737 This is an OFFICIAL meteorite name. Abbreviation: NWA 2737 Observed fall: No Year found: 2000posit at UAz. M. Killgore holds the main mass. Northwest Africa 2737 Morocco Find: 2000 Achondrite (Martian, 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, J. 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) δ17O = 2.40, δ18O = 4.02, ∆17O = 0.315; δ17O = 2.30, δ18O = 3.85, ∆17O = 0.295 (all ‰, n = 2). Furthermore, NWA 2737 displays trace element abundances similar to Chassigny. For example, its REE Country: Morocco Mass: 611 g Classificationpattern resembles that of Chassigny but with a more pronounced LREE enrichment. Classification: Achondrite (Martian, chassignite); highly shocked. Specimens: A 20 g type specimen is on deposit at ENSL. B. Fectay and C. Bidaut of La mémoire de la Terre hold the main mass. history: Meteoritical Bulletin: MB 90 (2006) Martian (chassignite) thank'shttps://www.lpi.usra.edu/meteor/docs/mb90.pdf Recommended: Martian (chassignite)
This is 1 of 3 approved meteorites classified as Martian (chassignite). Comments: Approved 1 Jul 2005 Revised 3 Feb 2006: Revised writeup Writeup Writeup from MB 90: Northwest Africa 2737
Morocco
Find: 2000
Achondrite (Martian, 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) δ17O = 2.40, δ18O = 4.02, ∆17O = 0.315; δ17O = 2.30, δ18O = 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.
Classification: Achondrite (Martian, chassignite); highly shocked.
Specimens: A 20 g type specimen is on deposit at ENSL. B. Fectay and C. Bidaut of La Mémoire de la Terre hold the main mass.
Data from: MB90 Table 2 Line 71: Place of purchase: Morocco Date: 2000 Mass (g): 611 Pieces: 9 Class: Martian Type spec mass (g): 20 Plots: O isotopes: Institutions and collections ENSL: Ecole Normale Supérieure de Lyon, Laboratoire de Sciences de la Terre, 46 allée d'Italie 69364 Lyon Cedex, France (institutional address; updated 27 Feb 2011) OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011) Fectay: Bruno Fectay and Carine Bidaut, La Memoire de la Terre SARL, 39800 Aumont, France; Website (private address) UBO: Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, place Nicolas Copernic, F-29280 Plouzané Cedex, France (institutional address; updated 23 Dec 2011) This ultimately rare angrite (also known as a achondrite meteorite) may have come from the planet Mercury. It was found in the Sahara Desert outside of Morocco in 2004.Météorite Chizé de Mars Communauté Trouver Valeurs actuelles pour vos antiquités! Météorite; Mercure ?, angrite, Maroc, NWA 4662, tranche, http: //www.prices4antiques.com/Meteorite-Mercury-Angrite ... grammes. Une météorite peut - être de la planète Mercure, un angrite, NWA 4662 jumelé avec NWA 2999 et NWA 3164, angrite, Maroc, découverte 2004. Angrites sont ... [plus de détails disponibles par abonnement] p4A article D9736297 Catégorie: Histoire naturelle Origine: Maroc Type: Année: météorites It boasts a nice lining of fusion crust (created when the rock enters the atmosphere), large polygonal grains of pink-purple anorthite, shocked black olivine, and ruby-red spinel in a fine-grained matrix.It boasts a nice lining of fusion crust (created when the rock enters the atmosphere), large polygonal grains of pink-purple anorthite, shocked black olivine, and ruby-red spinel in a fine-grained matrix.This ultimately rare angrite (also known as a achondrite meteorite) may have come from the planet Mercury. It was found in the Sahara Desert outside of Morocco in 2004. It boasts a nice lining of fusion crust (created when the rock enters the atmosphere), large polygonal grains of pink-purple anorthite, shocked black olivine, and ruby-red spinel in a fine-grained matrix.
Photo: Heritage Auctions THANK'S Commentaires Météorite Chizé de Mars Communauté
http://gizmodo.com/30-starry-wonders-hiding-inside-of... http://www.prices4antiques.com/Meteorite-Mercury-Angrite... |