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Northwest Africa 14641
Basic information Name: Northwest Africa 14641
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14641
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 840 g
Classification
  history:
Recommended:  Howardite    [explanation]

This is 1 of 421 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 19 Mar 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14641 (NWA 14641)

Howardite, (Northwest Africa)

Purchased: 2021 Sept

Classification: HED achondrite (Howardite)

History: The meteorite was purchased from a group of meteorites hunters in Nouadhibou, Mauritania in September, 2021.

Physical characteristics: Light grayish rock with some fusion crust.

Petrography: The meteorite is a clast-rich polymict breccia with a great diversity of mineral and lithic fragments set into a fine-grained clastic groundmass. Lithic fragments are up to 2 cm sized basaltic and black impact melt clasts. Predominant minerals are Fe-rich low-Ca pyroxenes with augite exsolution lamellae, diogenetic low-Ca pyroxene (about 30 vol%), ferroan unexsolved low-Ca pyroxene, zoned low-Ca pyroxene, olivine, and calcic plagioclase all with variable grain sizes. Diogenetic low-Ca pyroxenes are up to 2 mm in size. Minor phases include silica, Ti-poor chromite, ilmenite, and FeS. Metallic iron was not detected.

Geochemistry: low-Ca pyroxene host to augite exsolution lamellae: Fs55.0±0.4Wo2.3±0.6 (Fs54.0-55.5Wo1.8-3.6, FeO/MnO=27-30, n=7); augite exsolution lamellae: Fs26.5±0.3Wo37.9±0.4 (Fs25.9-27.0Wo37.4-38.6, FeO/MnO=25-30, n=7); diogenetic low-Ca pyroxene: Fs30.2±0.4Wo2.7±0.6 (Fs29.6-30.8Wo1.8-3.6, FeO/MnO=29-30, n=7); ferroan low-Ca-pyroxene: Fs42.1±0.2Wo1.9±0.1 (Fs41.7-42.4Wo1.8-2.0, FeO/MnO=26-28, n=7); zoned low-Ca-pyroxene: Fs25.6±2.5Wo1.8±0.1 (Fs22.8-29.2Wo1.7-1.8, FeO/MnO=27-29, n=7); olivine: Fa42.8±0.2 (Fa42.6-43.1, FeO/MnO=46±1, n=7); calcic plagioclase: An90.5±0.3 (An90.1-90.8, n=4)

Data from:
  MB111
  Table 0
  Line 0:
State/Prov/County:Howardite
Place of purchase:Nouadhibou, Mauritania
Date:P 2021 Sept
Mass (g):840
Pieces:1
Class:Howardite
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):42.8
Ferrosilite (mol%):55.0; 26.5; 30.2; 42.1; 25.6
Wollastonite (mol%):2.3; 37.9; 2.7; 1.9; 1.8
Classifier:A. Greshake, MNB
Type spec mass (g):25.3
Type spec location:MNB
Main mass:Salamu Ali
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. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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