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Northwest Africa 7415
Basic information Name: Northwest Africa 7415
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7415
Observed fall: No
Year found: 2012
Country: Mauritania
Mass:help 40.5 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 472 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 30 Sep 2013
Writeuphelp
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:
Place of purchase:Nouadhibou
Date:2011
Mass (g):40.5
Pieces:3
Class:Eucrite
Ferrosilite (mol%):52.5 (51.4-53.2, n=3)
Wollastonite (mol%):3.3 (2.2-4.4)
Magnetic suscept.:2.70-3.40
Classifier:Bart
Type spec mass (g):6.5 / 2.4
Type spec location:Kiel / MNRJ
Main mass:Bart
Finder:anonymous
Comments:Three fragments; submitted by R. Bartoschewitz
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
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Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 127 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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