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Northwest Africa 7294
Basic information Name: Northwest Africa 7294
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7294
Observed fall: No
Year found: 2012
Country: Mauritania
Mass:help 209 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 515 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 29 Sep 2013
Writeuphelp
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:
Place of purchase:Nouadhibou
Date:2011
Mass (g):209
Pieces:1
Class:Ureilite
Fayalite (mol%):19.4 (15.2-20.5, n=21)
Ferrosilite (mol%):17.2 (16.9-17.4, n=5)
Wollastonite (mol%):3.8 (3.7-3.9)
Magnetic suscept.:4.71
Classifier:Bart
Type spec mass (g):5.5 / 14.7
Type spec location:Kiel / MNRJ
Main mass:SBuhl, Bart
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:
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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