Meteoritical Bulletin: Entry for Northwest Africa 4438

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Northwest Africa 4438

Basic information

Name: Northwest Africa 4438
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4438
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass: 390 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	LL3
Recommended:			LL3 [explanation]

This is 1 of 452 approved meteorites classified as LL3. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 26 Sep 2019

Writeup

Writeup from MB 108:

Northwest Africa 4438 (NWA 4438)

(Northwest Africa)

Purchased: 2006

Classification: Ordinary chondrite (LL3)

History: Purchased by Marcin Cimała in 2006 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Well-formed chondrules (apparent diameter 760±300 µm, N=22) are set in a sparse, finer-grained matrix containing altered metal.

Geochemistry: Olivine (Fa_23.6±11.6(range Fa_5.8-40.2, N = 6); Cr₂O₃ in ferroan examples 0.01-0.44 wt.%, mean 0.10±0.13 wt.%, N = 9), low-Ca pyroxene (Fs_7.3Wo_2.1; Fs_8.8Wo_2.5), subcalcic augite (Fs_8.2Wo_27.7).

Classification: Ordinary chondrite (LL3). LL group based on magnetic susceptibility.

Specimens: 21.6 g including one polished thin section at PSF; remainder with Mr. M. Cimała.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Erfoud
Date:	P 2006
Mass (g):	390
Pieces:	1
Class:	LL3
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	23.6±11.6
Ferrosilite (mol%):	8.1±1.1
Wollastonite (mol%):	2.3±0.3
Magnetic suscept.:	3.25
Classifier:	A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):	21.6
Type spec location:	PSF
Main mass:	M. Cimala
Comments:	Work names MC013 and TB 946; submitted by A. Irving

Institutions
and collections

PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
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: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Photos:

Credit	Photos
Photos from the Encyclopedia of Meteorites:
Polandmet
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
stephen dunklee

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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