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Northwest Africa 13920
Basic information Name: Northwest Africa 13920
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13920
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 101 g
Recommended:  LL3-6    [explanation]

This is 1 of 33 approved meteorites classified as LL3-6.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 25 Apr 2021
Writeup from MB 110:

Northwest Africa 13920 (NWA 13920)

(Northwest Africa)

Purchased: 2020 Nov

Classification: Ordinary chondrite (LL3-6)

History: Purchased by Shun-Chung Yang and Juan Chen in November 2020 from a dealer in Tindouf, Algeria.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia containing sparse unequilibrated, glass-bearing chondrules (apparent diameter up to 3 mm), equilibrated Type 6 clasts (mostly recrystallized with some recognizable chondrules) and a large igneous-textured clast set in a sparse, highly stained matrix containing altered kamacite, taenite, low-Ti chromite, troilite, pentlandite and secondary barite. A large (1.4 cm) igneous-textured clast in the studied thin section is composed of prismatic grains of olivine and orthopyroxene (locally zoned through pigeonite to augite) with accessory Ti-free chromite and interstitial microlite-bearing glass.

Geochemistry: Olivine (Fa28.3±10.7, range Fa11.7-41.6, N = 5), low-Ca pyroxene (Fs24.9±1.2Wo1.5±0.2, range Fs24.2-26.3Wo1.3-1.7, N = 3). Igneous clast: olivine (Fa27.8-030.4, N = 2), low-Ca pyroxene (Fs24.5-25.2Wo3.5-4.2, N = 3), pigeonite (Fs21.3Wo13.2), augite (Fs10.5Wo43.1). Magnetic susceptibility of bulk specimen log χ (× 10-9 m3/kg) = 3.68.

Classification: Ordinary chondrite (LL3-6 breccia with large igneous clast).

Specimens: 20.7 g including one polished thin section at UWB; remainder with Mr. S.-C. Yang and Mr. J. Chen.

Data from:
  Table 0
  Line 0:
Place of purchase:Tindouf
Date:P 2020 Nov
Mass (g):101
Shock stage:S2
Weathering grade:W2/3
Fayalite (mol%):28.3±10.7
Ferrosilite (mol%):24.9±1.2
Wollastonite (mol%):1.5±0.2
Magnetic suscept.:3.68
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.7
Type spec location:UWB
Main mass:S.-C. Yang/J. Chen
Comments:Work name SCY-16; 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)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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