Meteoritical Bulletin: Entry for Northwest Africa 8641

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Northwest Africa 8641

Basic information

Name: Northwest Africa 8641
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8641
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 5.9 kg

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	Lunar (feldsp. breccia)
Recommended:			Lunar (feldsp. breccia) [explanation]

This is 1 of 336 approved meteorites classified as Lunar (feldsp. breccia). [show all]
Search for other: Lunar meteorites

Comments:

Approved 25 Nov 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 8641 (NWA 8641)

(Northwest Africa)

Purchased: 2014 May

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased in May 2014 by Darryl Pitt from a dealer in Erfoud, Morocco.

Physical characteristics: A large (5895 g) rounded, ellipsoidal dark gray stone with white clasts visible and with a beige, clayey coating on one side.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of light colored clasts in a darker matrix. Major minerals are olivine, orthopyroxene, pigeonite, augite and anorthite. Minor constituents include symplectitic intergrowths of fayalite+hedenbergite+silica polymorph, ilmenite, Ti-rich chromite, troilite, and rare exsolved pigeonite, kamacite and secondary barite.

Geochemistry: Olivine (Fa_23.3-31.8; FeO/MnO = 94-97, N = 3), orthopyroxene (Fs_29.7Wo_3.1; FeO/MnO = 64), pigeonite (Fs_24.1Wo_6.4; FeO/MnO = 59), augite (Fs_13.6-39.4Wo_39.4-43.5; FeO/MnO = 44-45, N = 2), plagioclase (An_94.6-99.7Or_0.3-0.1, N = 3). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 5.35, Na₂O 0.48; (in ppm) Sc 12.3, Ni 140, Ba 320, La 6.4, Sm 2.9, Eu 1.05, Yb 2.0, Lu 0.287, Hf 2.1, Th 0.90.

Classification: Lunar (feldspathic regolithic breccia).

Specimens: 20.5 g including a polished endcut at UWB. The remainder is held by DPitt.

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Erfoud
Date:	P 2014 May
Mass (g):	5895
Pieces:	1
Class:	Lunar (feldsp. breccia)
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	23.3-31.8
Ferrosilite (mol%):	29.7; 24.1; 13.6-39.4
Wollastonite (mol%):	3.1; 6.4; 39.4-43.5
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.5
Type spec location:	UWB
Main mass:	D. Pitt
Comments:	MAC 41; submitted by A. Irving

Institutions
and collections

UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full

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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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