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Northwest Africa 11281
Basic information Name: Northwest Africa 11281
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11281
Observed fall: No
Year found: 2007
Country: Morocco
Mass:help 3.45 kg
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  L6-melt breccia
Recommended:  L6-melt breccia    [explanation]

This is 1 of 48 approved meteorites classified as L6-melt breccia.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 4 Sep 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 11281 (NWA 11281)

Morocco

Purchased: 2007

Classification: Ordinary chondrite (L6, melt breccia)

History: The meteorite was purchased in 2007 from a meteorite dealer in Erfoud, Morocco

Physical characteristics: The main mass has no visible fusion crust and red-brown staining across its surface.

Petrography: (C. Herd, UAb) Cut surfaces reveal a light-gray interior with red-brown staining along fractures. About 2/3 of the thin section investigated is matrix, consisting of very fine-grained (10-50 μm) euhedral olivine and pyroxene crystals with interstitial plagioclase and disseminated sulfide grains. Clasts within this material are 200-1000 μm across and consist of microcrystalline pyroxene and olivine; similar sulfide and Fe-Ni metal clasts are also present. The remaining ~1/3 of the thin section consists of relict chondrules set in a dark, very fine-grained matrix rich in sulfide blebs. Chondrules are poorly delineated (indicative of petrologic type 6), although textures (such as BO) are preserved. Shock effects include strong mosaicism and recrystallization. Most Fe-Ni metal appears to have been replaced by terrestrial oxidation. No ringwoodite is evident, although the presence of wadsleyite cannot be ruled out.

Geochemistry: Geochem: (C. Herd, UAb) Olivine and pyroxene compositions in matrix and relict chondrules are indistinguishable from one another, within uncertainties. Olivine Fa24.3±1.1 (n=29); Low-Ca Pyroxene Fs19.8±1.4Wo2.1±0.9 (n=17).

Classification: L-melt breccia

Specimens: Type specimen of 22.5 g, including one thin section, is at UAb. Main mass at JTESM.

Data from:
  MB106
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2007
Mass (g):3450
Pieces:1
Class:L6-melt breccia
Shock stage:S6
Weathering grade:W2.0
Fayalite (mol%):24.3 ± 1.1 (n=29)
Ferrosilite (mol%):19.8 ± 1.4 (n=17)
Wollastonite (mol%):2.1 ± 0.9 (n=17)
Classifier:C. Herd, UAb
Type spec mass (g):22.5
Type spec location:UAb
Main mass:Joshua Tree Museum
Comments:Submitted by C. Herd
Institutions
   and collections
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
JTESM: Joshua Tree Earth And Space Museum PO BOX 101, Lakeville, IN 46536, United States (institutional address; updated 17 Dec 2016)
Catalogs:
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1505 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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