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Northwest Africa 5491
Basic information Name: Northwest Africa 5491
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5491
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 784 g
Recommended:  CV3    [explanation]

This is 1 of 605 approved meteorites (plus 1 unapproved name) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 8 Apr 2021
Writeup from MB 110:

Northwest Africa 5491 (NWA 5491)

(Northwest Africa)

Purchased: 2007 Sep

Classification: Carbonaceous chondrite (CV3)

History: Purchased by Eric Twelker in September 2007 from a dealer in Taliouine, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed granular, BO and PO chondrules (apparent diameter 710 ± 450 µm, N = 25) plus irregularly-shaped, very fine grained CAI are set in a fine grained matrix (~20 vol.%, sepia brown in thin section). Accessory phases include kamacite, taenite, Cr- magnetite and pentlandite. One unusual chondrule contains barred olivine plus interstitial melilite accompanied by minor gypsum

Geochemistry: Olivine (Fa20.4±21.3, range Fa1.7-59.2, N = 8), low-Ca pyroxene (Fs0.8±0.1Wo1.0±0.5, range Fs0.8-0.9Wo0.7-1.6, N =3), diopside (Fs0.8±0.4Wo43.8±0.6, range Fs0.0.5-1.1Wo44.2-43.3, N =23), magnetite (Cr2O3 = 1.2-1.5 wt.%, N = 2).

Classification: Carbonaceous chondrite (CV3).

Specimens: 24 g including one polished thin section at UWB; 20.1 g including one polished thin section at PSF; remainder with Mr. E. Twelker

Data from:
  Table 0
  Line 0:
Place of purchase:Taliouine
Date:P 2007 Sep
Mass (g):784
Shock stage:S2
Weathering grade:low
Fayalite (mol%):20.4±21.3
Ferrosilite (mol%):0.8±0.1
Wollastonite (mol%):1.0±0.5
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):40.1
Type spec location:UWB/PSF
Main mass:E. Twelker
Comments:Work name TEB 1230; 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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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Robert Smart   

     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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