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Northwest Africa 13937
Basic information Name: Northwest Africa 13937
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13937
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 1000 g
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 253 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 18 Jun 2021
Writeup from MB 110:

Northwest Africa 13937 (NWA 13937)

(Northwest Africa)

Purchased: 2021 Mar

Classification: Lunar meteorite (feldspathic breccia)

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

Physical characteristics: Eleven dark-grayish fragments without fusion crust.

Petrography: The meteorite displays a dark-grayish interior and is a feldspar-rich fragmental breccia predominantly composed of lithic and mineral clasts in partly shock melted and vesicular matrix. Lithic clasts are gabbroic and basaltic clasts up to 7 mm in size. Dominant minerals are olivine, low-Ca pyroxene, pigeonite, augite, and calcic plagioclase. Minor phases are ilmenite, Ti-bearing chromite, FeS, and kamacite. Some opx-chromite symplectites are present in olivine. The meteorite is highly shocked and plagioclase partly transformed into maskelynite.

Geochemistry: olivine: Fa23.7±3.4 (Fa18.8-28.0, n=12, FeO/MnO=84±10); low-Ca pyroxene: Fs22.5±0.2Wo4.4±0.2 (Fs22.2-22.8Wo4.0-4.6, n=6, FeO/MnO=48±3); pigeonite: Fs32.7±0.9Wo12.7±1.8 (Fs31.7-34.0Wo10.6-15.9, n=6, FeO/MnO=48±3); augite: Fs12.3±1.5Wo39.1±3.4 (Fs11.0-15.2Wo32.6-41.8, n=6, FeO/MnO=37±2); calcic plagioclase: An97.4±0.3 (An96.9-97.8, n=10)

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2021 Mar
Mass (g):1000
Class:Lunar (feldsp. breccia)
Shock stage:high
Weathering grade:low
Fayalite (mol%):23.7
Ferrosilite (mol%):22.5; 32.7; 12.3
Wollastonite (mol%):4.4; 12.7; 39.1
Classifier:A. Greshake, MNB
Type spec mass (g):24.3
Type spec location:MNB
Main mass:Hanno Strufe and Ismaily Sidi Mohamed, Erfoud, Morocco
Comments:Submitted by Ansgar Greshake
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8136 approved meteorites from (Northwest Africa) (plus 1942 unapproved names)

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