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Northwest Africa 13311
Basic information Name: Northwest Africa 13311
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13311
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 875 g
Recommended:  CK3    [explanation]

This is 1 of 75 approved meteorites classified as CK3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites
Comments: Approved 13 Jun 2020
Writeup from MB 109:

Northwest Africa 13311 (NWA 13311)

(Northwest Africa)

Purchased: 2019 Sep

Classification: Carbonaceous chondrite (CK3)

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

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed, relatively unequilibrated, granular, glass-bearing and Cr-magnetite-bearing chondrules (apparent diameter 920±380 µm, N = 23) plus amoeboid, very fine grained CAI are set in a fine grained matrix (~30 vol.%, sepia brown in thin section) containing pentlandite and troilite. CAI contain gehlenite, aluminous diopside, pentlandite, albitic plagioclase and hedenbergite.

Geochemistry: Olivine (Fa31.4±14.3, range Fa5.3-46.3, N = 8), low-Ca pyroxene (Fs0.9±0.3Wo0.9±0.2, range Fs0.6-1.1Wo0.8-1.1, N = 3), augite (Fs1.7Wo37.0; Fs0.5Wo1.6; Fs23.3Wo42.6; Al2O3 = 1.5-4.3 wt.%, N = 3), plagioclase (An84.6Or0.0).

Classification: Carbonaceous chondrite (CK3).

Specimens: 39.3 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 Sep
Mass (g):875
Shock stage:S2
Weathering grade:low
Fayalite (mol%):31.4±14.3
Ferrosilite (mol%):0.9±0.3
Wollastonite (mol%):0.9±0.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):39.3
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj L1; 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. 109, in preparation (2020)
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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