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Northwest Africa 11280
Basic information Name: Northwest Africa 11280
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11280
Observed fall: No
Year found: 2007
Country: Morocco
Mass:help 1568 g
Meteoritical Bulletin:  MB 106  (2018)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 425 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 31 May 2017
Writeup from MB 106:

Northwest Africa 11280 (NWA 11280)


Purchased: 2007

Classification: HED achondrite (Howardite)

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

Physical characteristics: The main mass is oriented, with flow lines visible on the dome-shaped side. It is mostly covered in fusion crust, which shows evidence of some terrestrial oxidation. The yellowish grey interior is visible where some fusion crust has flaked off. Cut surfaces reveal numerous, mostly gray clasts set in a fine-grained, yellow-grey matrix. Some terrestrial oxidation is evident.

Petrography: (C. Herd, UAb) Well-consolidated breccia of clasts up to 11 mm in longest dimension of diogenitic orthopyroxene (~30 vol%), coarse gabbroic or fine-grained intergranular plagioclase + (exsolved) clinopyroxene ± silica ± chromite ± ilmenite ± sulfide (~20 vol%), impact melt, olivine, pigeonite, orthopyroxene, chromite, and FeNi metal.

Geochemistry: (C. Herd, UAb) Diogenite orthopyroxene Fs24±1Wo2.3±0.6, Fe/Mn=30±1, n=31, eucrite pigeonite Fs58±5Wo6±2, Fe/Mn=29±1, n=12, eucrite augite Fs32±5Wo38±4, Fe/Mn=30±1, n=10; olivine Fo38.9±0.1, Fe/Mn=52±2, n=5; plagioclase An90.0±1.2Ab9.7±1.1Or0.4±0.1, n=18; high-Ti (4.3 wt% TiO2) and low-Ti (0.8 wt% TiO2) chromite.

Classification: Achondrite (howardite)

Specimens: Type specimen of 24.3 g, including one thin section, is at UAb. Main mass at JTESM.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2007
Mass (g):1568
Shock stage:low
Weathering grade:low
Classifier:C. Herd, UAb
Type spec mass (g):24.3
Type spec location:UAb
Main mass:Joshua Tree Museum
Comments:Submitted by C. Herd
   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)
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.
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     This is 1 of 1894 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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