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Northwest Africa 11921
Basic information Name: Northwest Africa 11921
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11921
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 7.7 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  Martian (polymict 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 15 Sep 2018
Revised 16 Nov 2018: Updated class; see NWA 7034)
Writeuphelp
Writeup from MB 107:

Northwest Africa 11921 (NWA 11921)

(Northwest Africa)

Purchased: 2018

Classification: Martian meteorite (polymict breccia)

History: Reportedly recovered in 2017 at the find site of NWA 7034 and purchased by Said Yousfi in 2018 from a local meteorite dealer in Zagora, Morocco.

Physical characteristics: Six black fragments with shiny crust.

Petrography: The meteorite is a polymict breccia composed of lithic and mineral clasts set into a very fine-grained clastic matrix. Lithic clasts include basaltic and impact melt types; most abundant mineral phases in clasts and matrix are pyroxene and feldspar, both of highly variable composition. Minor phases are ilmenite, magnetite, Ti,Cr-magnetite, and Cl-apatite. The meteorite’s high magnetic susceptibility reflects the high content of Fe-oxides and is in good agreement with data in Gattacceca et al. (2014).

Geochemistry: low-Ca pyroxene: Fs25.1±5.5Wo3.6±1.1 (Fs19.5-33.5Wo2.0-5.0, n=15, FeO/MnO=30-38); pigeonite: Fs39.9±12.0Wo8.0±2.7 (Fs25.6-52.3Wo5.6-12.4, n=10, FeO/MnO=30-40); Ca-pyroxene: Fs25.8±10.2Wo36.7±6.5 (Fs17.4-44.3Wo26.1-43.3, n=15, FeO/MnO=26-41); feldspar: An40.4±9.2Ab56.5±8.2Or3.1±1.9 (An29.0-49.3Ab48.3-66.7Or2.0-4.4, n=13)

Classification: Martian meteorite (polymict breccia). Likely paired with NWA 7034 and respective clan members.

Bibliography:
  • Gattacceca J., Suavet C., Rochette P., Weiss B.P., Winklhofer M., Uehara M. Friedrich J.M. (2014) Metal phases in ordinary chondrites: magnetic hysteresis properties and implications for thermal history. Meteorit. Planet. Sci. 49 652-676/ (link)
Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Zagora, Morocco
Date:P 2018
Mass (g):7.7
Pieces:6
Class:Martian
Weathering grade:low
Ferrosilite (mol%):25.1; 39.9; 25.8
Wollastonite (mol%):3.6; 8.0; 36.7
Magnetic suscept.:4.42
Classifier:A. Greshake, MNB
Type spec mass (g):1.55
Type spec location:MNB
Main mass:Said Yousfi
Comments:Submitted by Ansgar Greshake
Institutions
   and collections		 MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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