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Northwest Africa 14637
Basic information Name: Northwest Africa 14637
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14637
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 244 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 14637 (NWA 14637)

Howardite, (Northwest Africa)

Purchased: 2021 Dec

Classification: HED achondrite (Howardite)

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

Physical characteristics: Grayish rock mostly covered with fusion crust.

Petrography: The meteorite is a polymict breccia composed of a variety of mineral and lithic fragments set into a fine-grained clastic groundmass. Lithic fragments are up to 7 mm sized basaltic, gabbroic and black impact melt clasts. Predominant minerals are Fe-rich low-Ca pyroxenes with augite exsolution lamellae, diogenitic low-Ca pyroxene (about 20 vol%), ferroan unexsolved low-Ca pyroxene, and calcic plagioclase all with highly variable grain sizes. Diogenetic low-Ca pyroxenes are up to 700 µm in size. Minor phases include silica, Ti-poor chromite, ilmenite, FeS, and metallic iron.

Geochemistry: low-Ca pyroxene host to augite exsolution lamellae: Fs61.1±0.7Wo2.1±0.2 (Fs60.6-62.8Wo1.7-2.4, FeO/MnO=29-33, n=7); augite exsolution lamellae: Fs21.8±0.1Wo43.6±0.3 (Fs21.5-21.9Wo43.3-44.1, FeO/MnO=27-31, n=7); diogenetic pyroxene: Fs23.4±0.3Wo2.0±0.4 (Fs22.9-23.7Wo1.7-3.0, FeO/MnO=27-34, n=7); ferroan unexsolved low-Ca-pyroxene: Fs42.1±1.0Wo2.7±1.1 (Fs40.5-43.1Wo1.8-4.5, FeO/MnO=28-31, n=7); calcic plagioclase: An90.0±0.8 (An89.2-91.9, n=7)

Data from:
  MB111
  Table 0
  Line 0:
State/Prov/County:Howardite
Place of purchase:Morocco
Date:P 2021 Dec
Mass (g):244.2
Pieces:1
Class:Howardite
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):61.8; 21.8; 23.4; 42.1
Wollastonite (mol%):2.1; 43.6; 2.2; 2.7
Classifier:A. Greshake, MNB
Type spec mass (g):21.6
Type spec location:MNB
Main mass:Hanno Strufe
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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