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Northwest Africa 13909
Basic information Name: Northwest Africa 13909
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13909
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 987 g
Classification
  history:
Recommended:  L3.15    [explanation]

This is 1 of 8 approved meteorites classified as L3.15.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 21 Jun 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13909 (NWA 13909)

(Northwest Africa)

Purchased: 2020 Aug

Classification: Ordinary chondrite (L3.15)

History: Purchased by Shun-Chung Yang and Juan Chen in the period August to October 2020 from a dealer in Tindouf, Algeria.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed, fairly closely packed, glass-bearing chondrules (apparent diameter 870±350 µm, N = 24) are set in a dark, fine-grained matrix containing kamacite, troilite and minor taenite.

Geochemistry: Olivine Fa27.4±19.1, range Fa1.2-55.1 (N = 8). Cr2O3 in specifically selected ferroan olivine 0.07-0.49 wt.%, mean 0.19±0.12 wt.% (N = 30). Low-Ca pyroxene (Fs0.5Wo2.9), pigeonite (Fs4.2±6.9Wo11.2±4.6, range Fs0.4-16.5Wo5.8-15.6, N = 5), subcalcic augite (Fs17.6±5.4Wo34.0±0.1, range Fs13.8-21.4Wo33.9-34.1, N = 2). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.82.

Classification: Ordinary chondrite (L3.15). Petrologic subtype was determined from Fig. 15 of Grossman and Brearley (2005).

Specimens: 28.0 g including one polished thin section at UWB; remainder with Mr. S.-C. Yang and Mr. J. Chen.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Tindouf
Date:P 2020 Aug
Mass (g):987
Pieces:5
Class:L3.15
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):27.4±19.1
Ferrosilite (mol%):0.5; 4.2±6.9; 17.6±5.4
Wollastonite (mol%):2.9; 11.2±4.6; 34.0±0.1
Magnetic suscept.:4.82
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):28.0
Type spec location:UWB
Main mass:S.-C. Yang/J. Chen
Comments:Work name SCY-7; 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)
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7795 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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