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Northwest Africa 13733
Basic information Name: Northwest Africa 13733
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13733
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 287 g
Recommended:  LL(L)3    [explanation]

This is 1 of 23 approved meteorites classified as LL(L)3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 21 Feb 2021
Writeup from MB 110:

Northwest Africa 13733 (NWA 13733)


Purchased: 2020 Apr

Classification: Ordinary chondrite (LL(L)3)

History: Purchased by Mbark Arjdal in April 2020 from an Algerian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed, closely packed glass-bearing chondrules (apparent diameter 850±380 µm, N=25) are set in a fine grained matrix containing altered kamacite, troilite, taenite and chlorapatite.

Geochemistry: Olivine (Fa22.1±10.7, range Fa1.1-30.9, N = 8; Cr2O3 in ferroan olivine 0.01-0.06 wt.%, N = 6), low-Ca pyroxene (Fs16.8±11.3Wo1.7±2.1, range Fs6.9-29.1Wo0.3-4.1, N = 3), pigeonite (Fs14.1Wo6.8; Fs22.8Wo5.7; N = 2), augite (Fs11.2±7.1Wo40.1±1.8, range Fs3.7-17.9Wo41.3-38.1, N = 3). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.47.

Classification: Ordinary chondrite LL(L)3. Magnetic susceptibility is high for a W2 LL3, but chondrule size would be large for L. Hence the LL(L) classification.

Specimens: 42.6 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2020 Apr
Mass (g):287
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):22.1±10.7
Ferrosilite (mol%):16.8±11.3
Wollastonite (mol%):1.7±2.1
Magnetic suscept.:4.47
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):42.6
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 359; 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 1167 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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