NORTHWEST AFRICA 13309
LL3.15 CHONDRITE
This meteorite is officially classified & approved as NWA 13309 LL3.15 Chondrite
Classified by world renowned and profoundly respected Dr Anthony J. Irving and team at University of Washington.         
     
NWA 13309
 LL3.15 CHONDRITE 
DISCOVERED IN SEPTEMBER 2019
TIMBUKTU MALI 
51 GRAM

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OFFICIAL CLASSIFICATION DATA SOURCE:
THE METEORITICAL SOCIETY
INTERNATIONAL SOCIETY FOR METEORITICS AND PLANETARY SCIENCE
LUNAR AND PLANETARY INSTITUTE
METEORITICAL BULLETIN DATABASE

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Northwest Africa 13309
Basic informationName: Northwest Africa 13309
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13309
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 5.6 kg
Classification
  history:
Recommended:  LL3.15   

This is 1 of 10 approved meteorites classified as LL3.15.  
Comments:Approved 13 Jun 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13309 (NWA 13309)

(Northwest Africa)

Purchased: 2019 Sep

Classification: Ordinary chondrite (LL3.15)

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

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed, fairly closely packed, relatively unequilibrated, glass-bearing chondrules (apparent diameter 900 ± 560 µm, N = 23) plus some isolated mineral clasts are set in a sparse opaque matrix rich in kamacite, taenite and troilite.

Geochemistry: Olivine (Fa16.2±8.3, range Fa0.6-26.9, N = 9; Cr2O3 in ferroan olivines 0.07-0.55 wt.%, mean 0.25±0.16 wt.%, N = 33), low-Ca pyroxene (Fs14.4±5.0Wo1.5±1.8, range Fs7.4-21.5Wo0.3-4.7, N = 5), subcalcic augite (Fs19.2Wo31.1), diopside (Fs1.2Wo44.5). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.51.

Classification: Ordinary chondrite (LL3.15). Chondrule sizes and magnetic susceptibility support an LL rather than L class. Subtype based on Cr2O3 contents of ferroan olivines per Figure 15 of Grossman and Brearley (2005).

Specimens: 38.2 g including one polished thin section at UWB; remainder with Mr. M.Arjdal 

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:
  MB109
  Table 0
  Line 0:
Place of purchase:Timbuktu, Mali
Date:P 2019 Sep
Mass (g):5602
Pieces:6
Class:LL3.15
Shock stage:S2
Weathering grade:W1/2
Fayalite (mol%):16.2±8.3
Ferrosilite (mol%):14.4±5.0
Wollastonite (mol%):1.5±1.8
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):38.2
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 02; 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 Meteoritical Bulletin, no. 109, in preparation (2020)
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  history:
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