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Northwest Africa 13358
Basic information Name: Northwest Africa 13358
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13358
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 990 g
Recommended:  L5    [explanation]

This is 1 of 7227 approved meteorites (plus 4 unapproved names) classified as L5.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 4 Jul 2020
Writeup from MB 109:

Northwest Africa 13358 (NWA 13358)

(Northwest Africa)

Purchased: 2019 May

Classification: Ordinary chondrite (L5)

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

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Sparse, indistinct chondrules are present within a recrystallized matrix (stained orange-brown in thin section) containing chromite, troilite, pyrrhotite, merrillite. Secondary terrestrial weathering products include goethite (replacing primary metal), patchy Fe-Ni-Mn-bearing phosphate (?arupite) within merrillite, and a Ca sulfate phase.

Geochemistry: Olivine (Fa24.9±0.2, range Fa24.6-25.2, N = 5), low-Ca pyroxene (Fs20.8±0.1Wo1.5±0.2, range Fs20.7-20.9Wo1.2-1.7, N = 5), augite (Fs7.9±0.4Wo44.8±0.4, range Fs7.6-8.3Wo44.5-45.2, N = 3). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.16.

Classification: Ordinary chondrite (L5).

Specimens: 51.5 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 May
Mass (g):990
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):24.9±0.2
Ferrosilite (mol%):20.8±0.1
Wollastonite (mol%):1.5±0.2
Magnetic suscept.:4.15
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):51.5
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 237; 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 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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