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Northwest Africa 13860
Basic information Name: Northwest Africa 13860
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13860
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 16.2 g
Recommended:  LL6    [explanation]

This is 1 of 2843 approved meteorites (plus 1 unapproved name) classified as LL6.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 28 Mar 2021
Writeup from MB 110:

Northwest Africa 13860 (NWA 13860)

(Northwest Africa)

Purchased: 2020 Sep

Classification: Ordinary chondrite (LL6)

History: Purchased in September 2020 by Juan Avilés Poblador on behalf of UAlic from a dealer in Chinguetti, Mauritania.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) The specimen is a fresh, highly recrystallized breccia with some relatively large remnant chondrules in angular clasts. Accessory phases include sodic plagioclase, low-Ti chromite, taenite, troilite and chlorapatite. No kamacite was found.

Geochemistry: Olivine (Fa31.1±0.2, range Fa31.0-31.3, N = 5), low-Ca pyroxene (Fs25.0±0.3Wo2.1±0.2, range Fs24.5-25.4Wo1.9-2.3, N = 5), augite (Fs10.7±0.6Wo42.9±0.5, range Fs10.0-11.0Wo42.5-43.5, N = 3).

Classification: Ordinary chondrite (LL6 breccia).

Specimens: 4.3 g including one polished thin section at UWB; remainder in the collection of UAlic.

Data from:
  Table 0
  Line 0:
Place of purchase:Chinguetti, Mauritania
Date:P 2020 Sep
Mass (g):16.2
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):31.1±0.2
Ferrosilite (mol%):25.0±0.3
Wollastonite (mol%):2.1±0.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):4.3
Type spec location:UWB
Main mass:J. Poblador
Comments:Work name JAP20-9; 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)
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)
UAlic: Earth Sciences Department University of Alicante San Vicente del Raspeig, Spain (institutional address; updated 9 Feb 2020)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8138 approved meteorites from (Northwest Africa) (plus 1941 unapproved names)

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