Meteoritical Bulletin: Entry for Northwest Africa 13561

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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: 1.5 g

Classification
history:

Meteoritical Bulletin:	MB 109	(2020)	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 28 Nov 2020

Writeup

help

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: Fs_25.8±0.7Wo_3.8±0.4(Fs_24.6-26.6Wo_3.2-4.9, n=11, FeO/MnO=32±2); low-Ca host to augite exsolution lamellae: Fs_45.1±0.7Wo_5.9±0.6(Fs_44.3-46.3Wo_5.4-7.0, n=9, FeO/MnO=32-35); augite exsolution lamellae: Fs_18.0±0.2Wo_42.2±0.4(Fs_17.6-18.4Wo_41.6-42.9, n=15, FeO/MnO=26-32); complex zoned pyroxenes: Fs_32.4±4.2Wo_6.9±2.9(Fs_27.8-39.1Wo_4.8-12.5, n=10, FeO/MnO=32-36); feldspar: An_43.9±4.6Ab_54.5±4.4Or_1.6±0.2(An_36.7-49.4Ab_49.3-61.4Or_1.3-2.0, n=11).

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

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2020
Mass (g):	1.5
Pieces:	1
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

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)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
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