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Northwest Africa 13242
Basic information Name: Northwest Africa 13242
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13242
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 1237 g
Recommended:  L4    [explanation]

This is 1 of 1709 approved meteorites (plus 24 unapproved names) classified as L4.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 21 Mar 2020
Writeup from MB 109:

Northwest Africa 13242 (NWA 13242)

(Northwest Africa)

Purchased: 2019 Jun

Classification: Ordinary chondrite (L4)

History: Purchased by Mbark Arjdal in June 2019 from a Libyan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Fairly closely-packed, well-formed chondrules (apparent diameter 800±320 µm, N = 22) are set in a sparse matrix containing altered kamacite, pentlandite and ilmenite. A single CAI-like object (0.4 mm across) was observed; it is partially rimmed by kamacite and is composed predominantly of compositionally zoned Cr-pleonaste spinel with minor merrillite, Fe-Ni-bearing phosphate and rare baddeleyite.

Geochemistry: Olivine (Fa23.1±0.9, range Fa22.4-24.6, N = 5), low-Ca pyroxene (Fs22.6±4.6Wo2.2±2.1, range Fs18.6-29.6Wo0.7-2.1, N = 5), pigeonite (Fs21.4±3.0Wo5.1±0.1, range Fs19.3-23.5Wo5.0-5.2, N = 2; Fs18.9Wo14.0), subcalcic augite (Fs11.8±2.3Wo33.8±4.3, range Fs8.7-14.1Wo30.5-39.9, N = 4).

Classification: Ordinary chondrite (L4).

Specimens: 51 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  Table 0
  Line 0:
Place of purchase:Libya
Date:P 2019 Jun
Mass (g):1237
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):23.1±0.9
Ferrosilite (mol%):22.6±4.6
Wollastonite (mol%):1.2±0.6
Classifier:A. Irving, UWS, and P. Carpenter, WUSTL
Type spec mass (g):51.0
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 112; 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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