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Northwest Africa 16974
Basic information Name: Northwest Africa 16974
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16974
Observed fall: No
Year found: 2024
Country: (Northwest Africa)
Mass:help 423 g
Classification
  history:
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 344 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 13 Sep 2024
Writeuphelp
Writeup from MB 113:

Northwest Africa 16974 (NWA 16974)

(Northwest Africa)

Purchased: 2024

Classification: Lunar meteorite (feldspathic breccia)

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

Physical characteristics: Three dark grayish fragments lacking fusion crust.

Petrography: Breccia composed of up to 7 mm angular to subrounded mineral clasts of calcic plagioclase, olivine, patchily zoned pigeonite, and augite, plus impact melt clasts set in a fine-grained partly glassy and partly vesicular matrix. Minor phases include ilmenite, chromite, FeS, and FeNi metal. Vesicles are sometimes filled with secondary calcite.

Geochemistry: olivine: Fa32.1±0.1 (Fa31.9-32.4, FeO/MnO=91±4, n=7); more magnesian olivine: Fa23.1±0.2 (Fa22.9-23.4, FeO/MnO=78±3, n=7); zoned pigeonite: Fs35.0±2.1Wo8.2±3.7 (Fs30.7-37.2Wo5.0-15.9, FeO/MnO=52±4, n=7); Ca-pyroxene: Fs30.9±0.9Wo40.1±0.5 (Fs29.5-32.2Wo39.3-40.9, FeO/MnO=60±5, n=7); calcic plagioclase: An97.4±0.2 (An97.0-97.6, n=7)

Data from:
  MB113
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2024
Mass (g):423
Pieces:3
Class:Lunar (feldsp. breccia)
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):32.1; 23.1
Ferrosilite (mol%):35.0; 30.9
Wollastonite (mol%):8.2; 40.1
Classifier:A. Greshake, MNB
Type spec mass (g):20.8
Type spec location:MNB
Main mass:Mateusz Szysko
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. 113, in preparation (2024)
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9927 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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