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Northwest Africa 7291
Basic information Name: Northwest Africa 7291
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7291
Observed fall: No
Year found: 2012
Country: Mauritania
Mass:help 681 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  R3-5
Recommended:  R3-5    [explanation]

This is 1 of 14 approved meteorites classified as R3-5.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 29 Sep 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7291 (NWA 7291)

Mauritania

Found: 2011

Classification: Rumuruti chondrite (R3-5)

History: Discovered by local people in Mauritania in 2011, purchased in Nouadhibou in 2012 May.

Physical characteristics: Nine stones totaling 681 g, partly covered with fusion crust, saw-cut surface shows chondrules set in fine-grained, brown matrix and various lighter and darker clasts. Magnetic susceptibility log χ =3.08-3.20.

Petrography: Thin section shows numerous dominantly porphyritic, but also barred chondrules up to 1 mm (mean 0.3 mm), and various clasts set in fine-grained recrystallized matrix. The darker clasts show very fine matrix.

Geochemistry: (R. Bartoschewitz, Bart, P. Appel and B. Mader, Kiel) Olivine: Fa39.3-42.1, mean Fa39.9±0.7, n=15; Ca-low pyroxene: Fs19.8Wo1.1 (Fs11.3-32.8Wo0.4-1.8, n=2); Ca-pyroxene: Fs10-16En42-50Wo34-46; dark type 3 clast: Fa35.8-48.6, mean Fa40.7±6.1, n=20. Accessory chromite, pentlandite, troilite, apatite.

Classification: Rumuruti chondrite (R3-5)

Specimens: 15.8 g on deposit at MNRJ plus 4.3 g at Kiel, main mass SBuhl (102 g incl. a 72 g specimen) and 112 g with Bart.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Nouadhibou
Date:2011
Mass (g):681
Pieces:9
Class:R3-5
Shock stage:S3
Fayalite (mol%):39.9 (15.0-48.6, n=36)
Ferrosilite (mol%):19.8 (11.3-32.8, n=2)
Wollastonite (mol%):1.1 ( 0.4-1.8)
Magnetic suscept.:3.08-3.20
Classifier:Bart
Type spec mass (g):4.3 / 15.8
Type spec location:Kiel / MNRJ
Main mass:Bart, SBuhl
Finder:anonymous
Comments: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, Lehmweg 53, D-38518 Gifhorn, Germany; Website (private address; updated 4 Aug 2013)
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:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Antonello Petriccione   
Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 103 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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