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Northwest Africa 11522
Basic information Name: Northwest Africa 11522
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11522
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 3.2 g
Meteoritical Bulletin:  MB 107  (2018)  Martian (polymict breccia)
MB 106  (2018)  Martian (basaltic breccia)
Recommended:  Martian (polymict breccia)    [explanation]

This is 1 of 18 approved meteorites classified as Martian (polymict breccia).   [show all]
Search for other: Martian meteorites
Comments: Approved 21 Nov 2017
Revised 16 Nov 2018: Updated class; see NWA 7034)
Writeup from MB 106:

Northwest Africa 11522 (NWA 11522)

(Northwest Africa)

Purchased: 2013 Nov

Classification: Martian meteorite (basaltic breccia)

History: A single, dark stone was purchased from Darryl Pitt in November 2013.

Physical characteristics: The irregularly shaped stone showed no obvious fusion crust and had a very dark, desert varnished appearance. On the surface of the stone, some light coloured clasts could clearly be seen. X-ray micro-X-ray computer tomography (CT) was carried out at the NHM on receipt of the sample, both to validate that the sample appeared similar to other martian breccias i.e. NWA 7034, and to provide information to guide sub-sampling decisions.

Petrography: (C. Smith, NHM and B. Cohen, SUERC) SEM and microprobe investigaton of a polished block shows the specimen has a brecciated, polymict texture with mineral and lithic clasts set in an angular, fine grained matrix. Lithic clasts in the section studied are predominantly basaltic, although CT data showed the presence of impact melt clasts and spherules as have been previously described for e.g. NWA 7034. Main mineral phases observed are pyroxene, feldspar, Fe-Ti oxides and Fe-oxides with minor apatite.

Geochemistry: Mineral Compositions and Geochemistry: (C. Smith, NHM) plagioclase Ab53.7±6.0An44.1±0.7Or2.2±6.6 n=26; albitic feldspar Ab71.5±6.5An7.2±2.3Or21.2±8.7 n=5; potassium feldspar Ab31.0±4.5An6.2±2.3Or62.5±4.7 n=5; low-Ca pyroxene Fs32.3±6.4Wo7±4.4. Fe/Mn=32.0±4.6 n=35; augite Fs21.4±5.7Wo40±5.9 Fe/Mn=30.3±c2.9 n=17. A single olivine grain was analysed Fa57.1.

Classification: Martian meteorite (basaltic breccia)

Specimens: 948.2 mg main mass and type specimen at NHM. A probe block is held at SUERC.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2013 Nov
Mass (g):3.2
Class:Martian (basaltic breccia)
Weathering grade:Low
Fayalite (mol%):57.1
Ferrosilite (mol%):32.3±6.4 (N=35); 21.4±5.7 (N=17)
Wollastonite (mol%):7.0±4.4 (N=35); 40±5.9 (N=17)
Classifier:C. Smith, NHM and B. Cohen, SUERC
Type spec mass (g):0.948
Type spec location:NHM
Main mass:NHM
Comments:The specimen is texturally and mineralogically very similar to NWA 7034 and its numerous pairs, including NWA 11220, which was also classified at the NHM.; submitted by Caroline Smith
   and collections
NHM: Department of Mineralogy, The Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom; Website (institutional address; updated 9 Dec 2011)
SUERC: Scottish Universities Environmental Research Centre, East Kilbride G75 0QF, United Kingdom (institutional address; updated 17 Apr 2009)
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 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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