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Northwest Africa 13467
Basic information Name: Northwest Africa 13467
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13467
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 80 g
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 264 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 11 Nov 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13467 (NWA 13467)

(Northwest Africa)

Purchased: 2020

Classification: Martian meteorite (Shergottite)

History: The meteorite was bought by the main mass holder from a Moroccan meteorite dealer.

Physical characteristics: Dark brownish rock largely covered by fusion crust.

Petrography: The meteorite displays a fresh grayish to light greenish interior and has a fine-grained gabbroic texture predominantly composed of up to 600 µm sized calcic pyroxene, Fe-rich olivine, and often lath-shaped maskelynite grains. All these silicates show strong irregular compositional zoning. Some myrmekitic breakdown assemblages consisting of low-Ca pyroxene and iron oxides as well as patches of Si-rich mesostasis are present. Minor phases include ilmenite, ulvospinel, and pyrrhotite. The meteorite is highly shocked and contains shock melt pockets.

Geochemistry: Ca-pyroxene: Fs42.5±7.6Wo30.3±2.4 (Fs29.2-53.2Wo27.6-35.9, FeO/MnO=35±4, n=12); Fe-rich olivine: Fa78.0±9.3 (Fa61.9-91.7, FeO/MnO=33±9, n=19); maskelynite: An58.8±2.9Ab41.0±2.8Or0.2±0.1 (An53.6-63.3Ab36.7-46.2Or0.1-0.5, n=21); Si-rich mesostasis contains up to 3.5 wt% Al2O3

Classification: Martian (fine-grained gabbroic shergottite)

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):80
Pieces:1
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):78.0
Ferrosilite (mol%):42.5
Wollastonite (mol%):30.3
Classifier:A. Greshake, MNB
Type spec mass (g):16.2
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. 109, in preparation (2020)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Robert Smart   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8024 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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