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Northwest Africa 5490
Basic information Name: Northwest Africa 5490
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5490
Observed fall: No
Year found: 2008
Country: (Northwest Africa)
Mass:help 2.52 kg
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 10 Jan 2021
Writeup from MB 110:

Northwest Africa 5490 (NWA 5490)

Northwest Africa

Purchased: 2008 May

Classification: Ordinary chondrite (LL3)

History: Purchased by Eric Twelker in May 2008 from a dealer in Agadir, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed chondrules (apparent diameter 720±380 µm, N = 25) are set in a sparse, fine grained matrix containing altered metal.

Geochemistry: Olivine (Fa22.9±11.2, range Fa2.2-35.9, N = 11; Cr2O3 in ferroan olivine 0.01-0.09 wt.%, mean 0.04±0.03 wt.%, N = 5), low-Ca pyroxene (Fs20.9±3.4Wo1.9±1.2, range Fs14.6-24.9Wo0.3-3.2, N = 7), pigeonite (Fs18.8Wo9.3), subcalcic augite (Fs21.7Wo27.7; Fs23.5Wo34.2; N = 2), augite (Fs14.8Wo36.6), plagioclase (An83.1Or0.1). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.29.

Classification: Ordinary chondrite (LL3).

Specimens: 21.2 g including one polished thin section at UWB; 21 g including one polished thin section at PSF; remainder with Mr. E. Twelker

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2008 May
Mass (g):2523
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):22.9±11.2
Ferrosilite (mol%):20.9±3.4
Wollastonite (mol%):1.9±1.2
Magnetic suscept.:4.29
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):42.2
Type spec location:UWB/PSF
Main mass:E. Twelker
Comments:Work name TEB 1229; submitted by A. Irving
   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)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Twelker: Eric Twelker, P.O. Box 844, Port Townsend, WA 98368, United States; Website (private address; updated 1 Dec 2014)
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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