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Northwest Africa 5497
Basic information Name: Northwest Africa 5497
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5497
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 390 g
Recommended:  LL3    [explanation]

This is 1 of 501 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 9 Jul 2024
Writeup from MB 113:

Northwest Africa 5497 (NWA 5497)

(Northwest Africa)

Purchased: 2007 Sep

Classification: Ordinary chondrite (LL3)

History: Purchased by Marcin Cimala in September 2007 from a Moroccan dealer.

Petrography: (A. Irving, UWS, and J. Boesenberg, BrownU) Well-defined unequilibrated chondrules (apparent diameter 790±300 µm, N = 26) containing devitrified glass are set in a sparse matrix containing kamacite (altered to Fe oxides), troilite and chromite.

Geochemistry: Olivine (Fa15.6±15.5, range Fa1.6-54.0, N = 10; Cr2O3 in ferroan olivine 0.02-0.24 wt.%, mean 0.13±0.06 wt.%, N = 30), low-Ca pyroxene (Fs13.8±6.9Wo1.2±0.9, range Fs6.0-22.8Wo0.3-2.5, N = 9), pigeonite (Fs41.8Wo13.7), subcalcic augite (Fs27.4±19.7Wo24.0±2.3, range Fs14.1-56.0Wo21.9-27.3, N = 4). Magnetic susceptibility log χ (× 10-9 m3/kg) = 3.52.

Classification: Ordinary chondrite (LL3).

Specimens: 22.1 g including one polished thin section at YPMNH; remainder with Mr. M. Cimala.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2007 Sep
Mass (g):390
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):15.6±15.5
Ferrosilite (mol%):13.8±6.9
Wollastonite (mol%):1.2±0.9
Magnetic suscept.:3.52
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):22.1
Type spec location:YPMNH
Main mass:M. Cimala
Comments:Work names TB1243 and MC053; submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
YPMNH: Yale University Peabody Museum of Natural History P.O. Box 208118 New Haven, CT 06520-8118 , United States; Website (institutional address; updated 30 Aug 2014)
BrownU: Brown University Dept of Earth, Environmental and Planetary Sciences (DEEPS) 324 Brook Street Providence, RI 02912 , United States (institutional address; updated 21 Jul 2024)
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Dirk Hohmann      

     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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