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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:help 2.3 kg
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 329 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 12 Dec 2020
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: Fa21.3±11.1 (Fa9.9-44.3, FeO/MnO=79±8, n=26); fayalite: Fa95.5±0.2, FeO/MnO=85±3, n=6; low-Ca host to augite exsolution lamellae: Fs49.2±0.6Wo4.3±0.7 (Fs47.8-50.3Wo3.5-5.7, FeO/MnO=56±3, n=11); augite exsolution lamellae: Fs23.3±0.8Wo41.0±0.6 (Fs22.4-25.1Wo39.3-41.5, FeO/MnO=53±6, n=10); complex zoned pyroxene: Fs38.1±10.0Wo21.5±13.8 (Fs25.8-49.6Wo5.6-39.0, FeO/MnO=50±3, n=11); calcic plagioclase: An97.6±0.3 (An97.1-97.9, n=14)

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

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):2300
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
   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 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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