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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:
Meteoritical Bulletin:  MB 111  (2023)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 451 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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)
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Revision
  history:
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