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Northwest Africa 7449
Basic information Name: Northwest Africa 7449
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7449
Observed fall: No
Year found: 2009
Country: Western Sahara
Mass:help 405 g
Classification
  history:
Meteoritical Bulletin:  MB 101  (2012)  L6
Recommended:  L6    [explanation]

This is 1 of 10560 approved meteorites (plus 3 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 21 Sep 2012
Writeuphelp
Writeup from MB 101:

Northwest Africa 7449 (NWA 7449)        24°08’N, 13°10’W

Western Sahara

Found: July 2009

Classification: Ordinary chondrite (L6)

History: A single, completely fusion crusted stone was found in July 2009 by a nomad in the Gour Lafkah area, Morocco. The stone was broken into three fragments by the finder and eventually sold to collector R. Lenssen by a Moroccan meteorite dealer. The combined mass of the three fragments was 314 g. After the finder was urged to look for more stones, additionally a 91 g stone was found in September or October 2009. The total known mass is 405 g.

Physical characteristics: The three fragments of the stone that was found first show black fusion crust, next to a fresh, light grey to white interior. The 91 g stone found a few months later shows minor signs of weathering on the fusion crust and on a broken edge. This 91 g stone is covered by a somewhat thicker fusion crust than the first stone.

Petrography: Chondrules are poorly delineated and strongly recrystallized. Plagioclase grains are up to 0.2 mm in size. Troilite shows characteristic twinning lamellae. Besides dispersed grains, chromite and ilmenite form inclusions in iron metal. Cu metal is present at troilite-iron metal contacts.

Geochemistry: Electron microprobe analysis yielded olivine Fa23.3 (Fa22.2 by XRD), pyroxene Fs20.0Wo1.0. Cosmogenic radionuclides: (Patrick Weber, Laboratory for High Energy Physics, University of Bern): Gamma-spectroscopy performed in September 2009 showed the presence of the following short-lived radionuclides: 46Sc, 54Mn, 57Co, 22Na, 26Al. The 22Na/26Al activity ratio of 1.3 is in the range of recent falls. By comparison with the mean activities of 57Co, 51Cr, 54Mn and 46Sc at the time of fall of five other recent falls, a terrestrial age of 202±14 days (before Sept. 20, 2009) is estimated, indicating a fall in February or March 2009.

Classification: Ordinary chondrite (L6), shock stage S3, no weathering (W0).

Specimens: 27.8 g and two polished thin sections: NMBE. 371 g: R. Lenssen collection.

Data from:
  MB101
  Table 0
  Line 0:
State/Prov/County:Rio de Oro
Origin or pseudonym:Mountainous desert
Place of purchase:Agadir, Morocco
Date:July 2009
Latitude:24°08'N
Longitude:13°10'W
Mass (g):405
Pieces:2
Class:L6
Shock stage:S3
Weathering grade:W0
Fayalite (mol%):23.3
Ferrosilite (mol%):20.0
Wollastonite (mol%):1.0
Classifier:B. A. Hofmann (NMBE), F.J. Zurfluh, (IFGBE)
Type spec mass (g):27.8 g
Type spec location:NMBE
Main mass:R. Lenssen
Finder:unknown
Comments:Submitted by B. A. Hofmann
Institutions
   and collections
NMBE: Natural History Museum Bern Bernastrasse 15 CH-3005 Bern Switzerland, Switzerland; Website (institutional address; updated 2 Mar 2012)
Bern: University of Bern, University of Bern, Hochschulstrasse 4, CH-3012 Bern, Switzerland (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
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Geography:

Western Sahara
Coordinates:
     Recommended::   (24° 8'N, 13° 10'W)

Statistics:
     This is 1 of 34 approved meteorites from Rio de Oro, Western Sahara
     This is 1 of 182 approved meteorites from Western Sahara (plus 18 unapproved names)
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