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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:help 390 g
Classification
  history:
Recommended:  LL3    [explanation]

This is 1 of 320 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
Writeuphelp
Writeup from MB 108:

Northwest Africa 4438 (NWA 4438)

(Northwest Africa)

Purchased: 2006

Classification: Ordinary chondrite (LL3)

History: Purchased by Marcin Cimala 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 (Fa23.6±11.6 (range Fa5.8-40.2, N = 6); Cr2O3 in ferroan examples 0.01-0.44 wt.%, mean 0.10±0.13 wt.%, N = 9), low-Ca pyroxene (Fs7.3Wo2.1; Fs8.8Wo2.5), subcalcic augite (Fs8.2Wo27.7).

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. Cimala.

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, in preparation (2019)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Polandmet      
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
André Knöfel   
Arthur Rosen   
Gerald Armstrong   
Jean-Michel Masson   
METEORITES AUSTRALIA   
stephen dunklee   
Woreczko Jan & Wadi   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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