Meteoritical Bulletin: Entry for Northwest Africa 14637

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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: 244 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

Writeup

help

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: Fs_61.1±0.7Wo_2.1±0.2(Fs_60.6-62.8Wo_1.7-2.4, FeO/MnO=29-33, n=7); augite exsolution lamellae: Fs_21.8±0.1Wo_43.6±0.3(Fs_21.5-21.9Wo_43.3-44.1, FeO/MnO=27-31, n=7); diogenetic pyroxene: Fs_23.4±0.3Wo_2.0±0.4(Fs_22.9-23.7Wo_1.7-3.0, FeO/MnO=27-34, n=7); ferroan unexsolved low-Ca-pyroxene: Fs_42.1±1.0Wo_2.7±1.1(Fs_40.5-43.1Wo_1.8-4.5, FeO/MnO=28-31, n=7); calcic plagioclase: An_90.0±0.8(An_89.2-91.9, 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 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 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
history:

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