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Northwest Africa 13864
Basic information Name: Northwest Africa 13864
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13864
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 61.6 g
Recommended:  LL6-7    [explanation]

This is the only approved meteorite classified as LL6-7.
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 17 Jul 2021
Writeup from MB 110:

Northwest Africa 13864 (NWA 13864)

(Northwest Africa)

Purchased: 2019 Nov

Classification: LL6-7

History: Purchased by Mbark Arjdal in November 2019 from a dealer in Timbuktu, Mali.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia consisting of type 6 clasts (containing remnant chondrules) and Type 7 clasts (lacking chondrules and exhibiting triple grain junction textures) set in a finer grained matrix. Accessory phases include merrillite, taenite, troilite and pentlandite (the last three as relatively large composite grains). Minor secondary barite is also present.

Geochemistry: Olivine (Fa31.7±1.4, range Fa29.0-32.7, N = 6), low-Ca pyroxene (Fs25.3±1.3Wo2.1±0.3, range Fs23.8-26.0Wo1.7-2.4, N = 5), augite (Fs10.4±0.1Wo43.9±0.1, range Fs10.3-10.5Wo43.8-44.0, N = 2), plagioclase (Ab84.6An11.0Or4.4).

Classification: Ordinary chondrite (LL6-7 breccia).

Specimens: 15.2 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  Table 0
  Line 0:
Place of purchase:Timbuktu, Mali
Date:P 2019 Nov
Mass (g):61.6
Shock stage:S2
Weathering grade:W0-1
Fayalite (mol%):31.7±1.4
Ferrosilite (mol%):25.3±1.3
Wollastonite (mol%):2.1±0.3
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):15.2
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 701; 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 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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