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Northwest Africa 7415 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7415 This is an OFFICIAL meteorite name. Abbreviation: NWA 7415 Observed fall: No Year found: 2012 Country: Mauritania Mass: 40.5 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 598 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 30 Sep 2013 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 102:
Northwest Africa 7415 (NWA 7415) Mauritania Found: 2011 Classification: HED achondrite (Eucrite) History: Discovered by local people in Mauritania in 2011, purchased in Nouadhibou in 2012 March. Physical characteristics: Three dark gray stones of 36.2, 2.3, and 2.0 g. The biggest one is partly covered by black fusion crust. Saw-cut shows breccia of fine-grained gray groundmass with darker clasts and small white mineral inclusions. Magnetic susceptibility log χ =2.70-3.40. Petrography: (R. Bartoschewitz, Bart) Microprobe examination of a thin section shows fine-grained (0.1 mm) cataclastic groundmass with fractured fragments of pyroxene and plagioclase up to 1 mm. Most pyroxenes show exsolution lamellae. Geochemistry: (R. Bartoschewitz, Bart, P. Appel and B. Mader, Kiel) Ca-poor pyroxene: Fs51.4-53.2Wo2.2-4.4, mean Fs52.5±0.94Wo3.3±3.3 (n=3). Ca-pyroxene: Fs45.0-55.1En48.8-34.1Wo5.3-20.5, mean Fs49.7±2.4En37.1±2.7Wo13.2±3.6 (n=44). Feldspar: An73-95Or<3 (n=64). Accessory chromite: Cr/(Cr+Al) = 68, Fe/(Fe+Mg) = 94 (n=2) and ilmenite. Classification: Achondrite (Eucrite-monomict). Specimens: 6.5 g on deposit at Kiel plus 2.4 g at MNRJ, main mass SBuhl (20 g) and 10 g with Bart. | ||||||||||||||||||||||||||||
Data from: MB102 Table 0 Line 0: |
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Institutions and collections |
Kiel: Geologisches und Mineralogisches Museum, Institut für Geowissenschaften, Christian-Albrechts-Universität Kiel, Ludewig-Mayn-Str. 10, D-24118 Kiel, Germany, Germany (institutional address; updated 13 Sep 2013) MNRJ: Museu Nacional, Quinta da Boa Vista, Rio de Janeiro, CEP 20940-040, Brazil (institutional address; updated 26 Dec 2011) Bart: Bartoschewitz Meteorite Laboratory, Weiland 37, D-38518 Gifhorn, Germany; Website (private address; updated 30 Nov 2019) SBuhl: Meteorite Recon (Mr. S Buhl), Muehlendamm 86, 22087 Hamburg, Germany (private address; updated 14 May 2010) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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Geography: |
Statistics: This is 1 of 220 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters) | ||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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