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Northwest Africa 14638
Basic information Name: Northwest Africa 14638
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14638
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 280 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 14638 (NWA 14638)

Howardite, (Northwest Africa)

Purchased: 2021 Nov

Classification: HED achondrite (Howardite)

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

Physical characteristics: Dark grayish rock without fusion crust.

Petrography: The meteorite shows a grayish interior and is a polymict breccia composed of 5 mm lithic clasts (fine-grained basaltic, gabbroic, impact melt) mineral clasts set into a fine-grained clastic mineral matrix. Predominant minerals are Fe-rich low-Ca pyroxenes with augite exsolution lamellae, diogenetic low-Ca pyroxene (about 25 vol%), zoned low-Ca pyroxene, olivine, and calcic plagioclase all with highly variable grain sizes. Diogenetic low-Ca pyroxenes are up to 800 µm in size. Minor phases include silica, Ti-poor chromite, ilmenite, FeS, and metallic iron. Contains secondary calcite and barite.

Geochemistry: low-Ca pyroxene: Fs57.0±0.2Wo5.0±0.3 (Fs56.7-57.2Wo4.6-5.3, FeO/MnO=27-29, n=7); augite exsolution lamellae: Fs24.0±1.1Wo40.0±2.2 (Fs22.5-25.9Wo35.9-42.7, FeO/MnO=25-27, n=7); diogenetic low-Ca pyroxene: Fs34.9±0.6Wo5.3±1.0 (Fs33.9-36.0Wo3.9-7.4, FeO/MnO=25-27, n=7); zoned low-Ca pyroxene: Fs27.5±5.3Wo1.6±0.2 (Fs21.0-33.1Wo1.3-1.8, FeO/MnO=25-30, n=7); olivine: Fa18.1±0.1 (Fa17.9-18.3, FeO/MnO=39±2, n=7); magnesian olivine: Fa9.3±0.1 (Fa9.2-9.3, FeO/MnO=33±3, n=7); calcic plagioclase: An87.7±3.2 (An83.4-91.3, n=7)

Data from:
  MB111
  Table 0
  Line 0:
State/Prov/County:Howardite
Place of purchase:Nouadhibou, Mauritania
Date:P 2021 Nov
Mass (g):280
Pieces:1
Class:Howardite
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):18.1; 9.3
Ferrosilite (mol%):57.0; 24.0; 34.9; 27.5
Wollastonite (mol%):5.0; 40.0; 5.3; 1.6
Classifier:A. Greshake, MNB
Type spec mass (g):20.2
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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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ryan Upchurch   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)
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Revision
  history:
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