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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 574 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 Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Mirko Graul                        
Robert Smart   
The Wilcox Collection of Meteorites      

     This is 1 of 8138 approved meteorites from (Northwest Africa) (plus 1941 unapproved names)

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