Meteoritical Bulletin: Entry for Northwest Africa 2632

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Northwest Africa 2632

Basic information

Name: Northwest Africa 2632
This is an OFFICIAL meteorite name.
Abbreviation: NWA 2632
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass: 730 g

Classification
history:

Recommended:

LL3.15 [explanation]

This is 1 of 23 approved meteorites classified as LL3.15. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 11 Apr 2024

Writeup

help

Writeup from MB 113:

Northwest Africa 2632 (NWA 2632)

(Northwest Africa)

Purchased: 2004

Classification: Ordinary chondrite (LL3.15)

History: Purchased by Michael Farmer in 2004 from a Moroccan dealer.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Well-defined, closely-packed unequilibrated chondrules (apparent diameter 910±300 µm, N = 27) containing devitrified glass are set in a fine-grained matrix containing kamacite (stained with secondary Fe oxides), chromite and troilite.

Geochemistry: Olivine (Fa_19.1±10.4, range Fa_6.4-48.5, N = 19; Cr₂O₃ in ferroan olivine 0.03-0.59 wt.%, mean 0.16±0.12 wt.%, N = 31), low-Ca pyroxene (Fs_8.6±7.0Wo_1.2±1.2, range Fs_1.6-25.3Wo_0.3-4.2, N = 16), pigeonite (Fs_8.9Wo_8.1). Magnetic susceptibility log χ (× 10^-9 m³/kg) = 3.21.

Classification: Ordinary chondrite (LL3.15). Petrologic subtype based on the mean and standard deviation of Cr₂O₃ contents in ferroan olivine per Figure 15a of Grossman and Brearley (2005).

Specimens: 42.7 g including one polished thin section at BrownU; remainder with Farmer.

Bibliography:

Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)

Data from:
  MB113
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2004
Mass (g):	730
Pieces:	1
Class:	LL3.15
Shock stage:	S2
Weathering grade:	W1
Fayalite (mol%):	19.1±10.4
Ferrosilite (mol%):	8.6±7.0
Wollastonite (mol%):	1.2±1.2
Magnetic suscept.:	3.21
Classifier:	A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):	42.7
Type spec location:	BrownU
Main mass:	Farmer
Comments:	Work names F8 and TB547, thin section QJF3; 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)
BrownU: Joseph Boesenberg Brown University Dept of Earth, Environmental and Planetary Sciences (DEEPS) 324 Brook Street Providence, RI 02912 , United States (institutional address; updated 4 Jan 2024)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 113, in preparation (2024)

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
David Hardy

Geography:

Coordinates:

Unknown.

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

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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