Meteoritical Bulletin: Entry for Northwest Africa 13909

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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: 987 g

Classification
history:

Recommended:

L3.15 [explanation]

This is 1 of 9 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

Writeup

help

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 Fa_27.4±19.1, range Fa_1.2-55.1(N = 8). Cr₂O₃ in specifically selected ferroan olivine 0.07-0.49 wt.%, mean 0.19±0.12 wt.% (N = 30). Low-Ca pyroxene (Fs_0.5Wo_2.9), pigeonite (Fs_4.2±6.9Wo_11.2±4.6, range Fs_0.4-16.5Wo_5.8-15.6, N = 5), subcalcic augite (Fs_17.6±5.4Wo_34.0±0.1, range Fs_13.8-21.4Wo_33.9-34.1, 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 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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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9344 approved meteorites from (Northwest Africa) (plus 1872 unapproved names)

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