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Northwest Africa 13309
Basic information Name: 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    [explanation]

This is 1 of 17 approved meteorites classified as LL3.15.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
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)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Wojciech Moscinski   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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