Meteoritical Bulletin: Entry for Northwest Africa 13546

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Northwest Africa 13546

Basic information

Name: Northwest Africa 13546
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13546
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass: 2.3 kg

Classification
history:

Meteoritical Bulletin:	MB 109	(2020)	Lunar (feldsp. breccia)
Recommended:			Lunar (feldsp. breccia) [explanation]

This is 1 of 336 approved meteorites classified as Lunar (feldsp. breccia). [show all]
Search for other: Lunar meteorites

Comments:

Approved 12 Dec 2020

Writeup

help

Writeup from MB 109:

Northwest Africa 13546 (NWA 13546)

(Northwest Africa)

Purchased: 2020

Classification: Lunar meteorite (feldspathic breccia)

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

Physical characteristics: Many small greyish fragments some of which covered with fusion crust.

Petrography: The meteorite displays a grayish interior and is a feldspathic breccia composed of mineral fragments, basaltic, gabbroic, and impact melt clasts cemented by a fine-grained partly shock-melted groundmass. Most abundant minerals are calcic plagioclase, olivine of highly variable composition, and exsolved pyroxene; less abundant are and complex zoned pyroxenes. Accessories include ilmenite, and FeNi-metal. The meteorite contains shock melt veins and pockets.

Geochemistry: olivine: Fa_21.3±11.1(Fa_9.9-44.3, FeO/MnO=79±8, n=26); fayalite: Fa_95.5±0.2, FeO/MnO=85±3, n=6; low-Ca host to augite exsolution lamellae: Fs_49.2±0.6Wo_4.3±0.7(Fs_47.8-50.3Wo_3.5-5.7, FeO/MnO=56±3, n=11); augite exsolution lamellae: Fs_23.3±0.8Wo_41.0±0.6(Fs_22.4-25.1Wo_39.3-41.5, FeO/MnO=53±6, n=10); complex zoned pyroxene: Fs_38.1±10.0Wo_21.5±13.8(Fs_25.8-49.6Wo_5.6-39.0, FeO/MnO=50±3, n=11); calcic plagioclase: An_97.6±0.3(An_97.1-97.9, n=14)

Classification: Lunar meteorite (feldspathic breccia); likely paired with NWA 11273

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2020
Mass (g):	2300
Pieces:	many
Class:	Lunar (feldsp. breccia)
Shock stage:	moderate
Weathering grade:	low
Fayalite (mol%):	21.3; 95.5
Ferrosilite (mol%):	49.2; 23.3; 38.1
Wollastonite (mol%):	4.3; 41.0; 21.5
Classifier:	A. Greshake, MNB
Type spec mass (g):	21.1
Type spec location:	MNB
Main mass:	Larbi Chnaoui
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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