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Northwest Africa 7294 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7294 This is an OFFICIAL meteorite name. Abbreviation: NWA 7294 Observed fall: No Year found: 2012 Country: Mauritania Mass: 209 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 658 approved meteorites classified as Ureilite. [show all] Search for other: Achondrites, Ureilites | ||||||||||||||||||||||||||||||
Comments: | Approved 29 Sep 2013 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 102:
Northwest Africa 7294 (NWA 7294) Mauritania Found: 2011 Classification: Ureilite History: Discovered by local people in Mauritania in 2011, purchased in Nouadhibou in 2012 May. Physical characteristics: Single 209 g stone, irregular, dark exterior with remnant patches of fusion crust. Sawn surface shows brown clasts in nearly black groundmass, with scattered, small worm-like metal inclusions. Magnetic susceptibility log χ = 4.71. Petrography: Microprobe examination of a thin section shows olivine, ortho- and clinopyroxene crystallites with triple junctions, mean grain size 1 mm. Large (~4 mm) pigeonite poikilitically enclose olivine crystals. Olivine shows irregular and parallel fractures. Graphite and metal form intergranular patches and grain boundaries. Geochemistry: (R. Bartoschewitz, Bart, P. Appel and B. Mader, Kiel) Olivine: Fa15.2-20.5, mean 19.4, σ = 1.29; Cr2O3=0.5-1.0 wt.%; Fe/Mn=43, σ=6.6 (n=21). Low-Ca pyroxene: Fs16.9-17.4, mean 17.5, σ = 0.19; Wo3.7-3.9, mean 1,3, σ = 0.09 (n=5). Kamacite: Ni=0.2-5.5, Co=0.2-0.6, Si=0-7.8 wt.%. Classification: Ureilite (bimodal) Specimens: 14.7 g on deposit at MNRJ plus 5.5 g at Kiel, main mass Bart (88 g) and 82 g with SBuhl. | ||||||||||||||||||||||||||||||
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) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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