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Northwest Africa 15490
Basic information Name: Northwest Africa 15490
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15490
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 2.2 kg
Classification
  history:
Recommended:  LL3    [explanation]

This is 1 of 441 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 4 Dec 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15490 (NWA 15490)

(Northwest Africa)

Purchased: 2022

Classification: Ordinary chondrite (LL3)

History: Purchased by Nicholas Gessler in 2022 from a Moroccan dealer.

Physical characteristics: A brick-shaped individual stone (2200 g, 16x7x7 cm) with one fusion crusted face.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Well-formed unequilibrated chondrules (apparent diameter 1070±620 µm, N = 25; one chondrule 5 mm) containing devitrified glass are set in a fine grained matrix containing kamacite, taenite, augite, troilite and chromite.

Geochemistry: Olivine (Fa23.8±12.1, range Fa4.5-53.6, N = 16; Cr2O3 in ferroan olivine 0.02-0.30 wt.%, mean 0.08±0.07 wt.%, N = 14), low-Ca pyroxene (Fs11.1±6.5Wo0.6±0.5, range Fs5.0-17.8Wo0.2-1.3, N = 4), pigeonite (Fs11.2Wo5.6; Fs22.0±1.7Wo12.1±1.2, range Fs20.9-23.2Wo11.2-12.9; N = 3), subcalcic augite (Fs8.7Wo31.9). Magnetic susceptibility log χ (× 10-9 m3/kg) = 3.48.

Classification: Ordinary chondrite (LL3).

Specimens: 23.2 g plus one polished thin section at UWB; remainder with Mr. N. Gessler.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2022
Mass (g):2200
Pieces:1
Class:LL3
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):23.8±12.1
Ferrosilite (mol%):11.1±6.5
Wollastonite (mol%):0.6±0.5
Magnetic suscept.:3.48
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):23.2
Type spec location:UWB
Main mass:N. Gessler
Comments:Work name NG-FV; submitted by A. Irving
Institutions
   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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Gessler: Nicholas Gessler, 2010 Calgary Lane, Los Angeles, CA 90077, United States (private address; updated 7 Jul 2016)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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