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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 24 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 1315 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters)

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