Meteoritical Bulletin: Entry for Northwest Africa 13242

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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: 1237 g

Classification
history:

Recommended:

L4 [explanation]

This is 1 of 1715 approved meteorites (plus 4 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

help

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 (Fa_23.1±0.9, range Fa_22.4-24.6, N = 5), low-Ca pyroxene (Fs_22.6±4.6Wo_2.2±2.1, range Fs_18.6-29.6Wo_0.7-2.1, N = 5), pigeonite (Fs_21.4±3.0Wo_5.1±0.1, range Fs_19.3-23.5Wo_5.0-5.2, N = 2; Fs_18.9Wo_14.0), subcalcic augite (Fs_11.8±2.3Wo_33.8±4.3, range Fs_8.7-14.1Wo_30.5-39.9, N = 4).

Classification: Ordinary chondrite (L4).

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

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Libya
Date:	P 2019 Jun
Mass (g):	1237
Pieces:	5
Class:	L4
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

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)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7655 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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