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Northwest Africa 11288
Basic information Name: Northwest Africa 11288
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11288
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 407 g
Meteoritical Bulletin:  MB 106  (2018)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 329 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 9 Jun 2017
Writeup from MB 106:

Northwest Africa 11288 (NWA 11288)

(Northwest Africa)

Purchased: 2015 Jan 19

Classification: Martian meteorite (Shergottite)

History: Purchased by Marc Jost Agadir, Morocco, from Aziz Habibi

Physical characteristics: Greenish gray, heterogeneous looking stones (five fragments of 7.14 to 332.5 g) with partially preserved fusion crust.

Petrography: (B. Hofmann, NMBE and Å. Rosén, Bern) The meteorite consists of dominant calcic pyroxene occurring as elongated crystals 2-3 mm in length and maskelynite typically 1-2 mm in size. Rare free silica intergrown with maskelynite. The meteorite shows a high abundance of vesicular glasses, a dark one is shock melt and a lighter one possibly fusion crust intruded into preexisting cavities.

Geochemistry: (Å. Rosén, Bern and B. Hofmann, NMBE) Pyroxene compositions are Fs36.4±10.9Wo25.3±8.7 (Fs20.6-65.5Wo9.2-35.6), mean FeO/MnO = 33.3±5.4 (n=120). Maskelynite has An50.1±3.7Or2.3±1.2 (An40.7-54.7Or1.3-6.2). Dark/green glass has SiO2 50.8/49.3, Al2O3 8.06/8.15, CaO 11.5/11.3, MgO 7.7/7.6, FeO 18.1/18.3, MnO 0.48/0.49, Na2O 1.04/1.53, K2O 0.18/0.07, TiO2 0.88/0.92, Cr2O3 0.16/0.16, FeO/MnO 38.1/37.7 (n= 16/20). Oxygen isotopes: (R. Greenwood, OU) δ18O=4.932, δ17O=2.902, Δ17O= 0.337 (all ‰).

Classification: Based on petrography, mineral compositions (including Fe/Mn-ratios) and oxygen isotopes this is a strongly shocked shergottite.

Specimens: 31.1 g plus one polished thin section at NMBE. Main mass: Marc Jost, SJS.

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir, Morocco
Date:P 2015 Jan 19
Mass (g):406.6
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):36.4±10.9
Wollastonite (mol%):25.3±8.7
Classifier:B. Hofmann, NMBE, Å. Rosén, Bern
Type spec mass (g):31.1
Type spec location:NMBE
Main mass:SJS
Comments:Submitted by Beda Hofmann
Plots: O isotopes:  
   and collections
NMBE: Natural History Museum Bern Bernastrasse 15 CH-3005 Bern Switzerland, Switzerland; Website (institutional address; updated 2 Mar 2012)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
Bern: University of Bern, University of Bern, Hochschulstrasse 4, CH-3012 Bern, Switzerland (institutional address)
SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010)
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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Photos from the Encyclopedia of Meteorites:
Sergey Vasiliev   

     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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