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Northwest Africa 13561
Basic information Name: Northwest Africa 13561
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13561
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 1.5 g
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 28 Nov 2020
Writeup from MB 109:

Northwest Africa 13561 (NWA 13561)

(Northwest Africa)

Purchased: 2020

Classification: Martian meteorite (polymict breccia)

History: The meteorite was purchased from a dealer in Morocco.

Physical characteristics: Small black individual partly covered with fusion crust.

Petrography: The meteorite displays a black interior and is a polymict breccia composed of basaltic, impact melt, and mineral clasts set into a very fine-grained clastic matrix. Most abundant mineral phases in clasts and matrix are pyroxene and feldspar, both of highly variable composition. In basaltic clasts, plagioclase is often lath-shaped. Minor phases include silica, ilmenite, magnetite, and Ti,Cr-magnetite.

Geochemistry: low-Ca pyroxene: Fs25.8±0.7Wo3.8±0.4 (Fs24.6-26.6Wo3.2-4.9, n=11, FeO/MnO=32±2); low-Ca host to augite exsolution lamellae: Fs45.1±0.7Wo5.9±0.6 (Fs44.3-46.3Wo5.4-7.0, n=9, FeO/MnO=32-35); augite exsolution lamellae: Fs18.0±0.2Wo42.2±0.4 (Fs17.6-18.4Wo41.6-42.9, n=15, FeO/MnO=26-32); complex zoned pyroxenes: Fs32.4±4.2Wo6.9±2.9 (Fs27.8-39.1Wo4.8-12.5, n=10, FeO/MnO=32-36); feldspar: An43.9±4.6Ab54.5±4.4Or1.6±0.2 (An36.7-49.4Ab49.3-61.4Or1.3-2.0, n=11).

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

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):1.5
Class:Martian (polymict breccia)
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):25.8, 45.1, 18.0, 32.4
Wollastonite (mol%):3.8; 5.9; 42.2; 6.9
Classifier:A. Greshake, MNB
Type spec mass (g):0.32
Type spec location:MNB
Main mass:Philippe Schmitt-Kopplin
Comments:Submitted by Ansgar Greshake
   and collections
MNB: Museum f├╝r Naturkunde, Invalidenstra├če 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 8777 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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