Meteoritical Bulletin: Entry for Northwest Africa 13324

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Northwest Africa 13324

Basic information

Name: Northwest Africa 13324
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13324
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass: 5 kg

Classification
history:

Recommended:

LL3.15 [explanation]

This is 1 of 17 approved meteorites classified as LL3.15. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 4 Jul 2020

Writeup

help

Writeup from MB 109:

Northwest Africa 13324 (NWA 13324)

(Northwest Africa)

Purchased: 2020 Jan

Classification: Ordinary chondrite (LL3.15)

History: Purchased by Adam Aaronson in Temara, Morocco in January 2020.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Closely-packed, well-formed, unequilibrated glass-bearing chondrules (apparent diameter 800±330 µm, N = 24) are set in a sparse opaque matrix containing altered kamacite, taenite and troilite.

Geochemistry: Olivine (Fa_14.2±9.1, range Fa_1.2-38.4, N = 9; Cr₂O₃ in ferroan olivine 0.06-0.61 wt.%, mean 0.27±0.13 wt.%, N = 31), low-Ca pyroxene (Fs_16.4±6.7Wo_1.3±1.4, range Fs_4.7-25.0Wo_0.4-3.9, N = 7), pigeonite (Fs_20.2Wo_8.0), subcalcic augite (Fs_20.2±8.4Wo_27.0±2.6, rangeFa_10.8-27.0Wo_29.9-24.7, N = 3), augite (Fs_4.3Wo_40.4). Magnetic susceptibility log χ (× 10^-9 m³/kg) = 4.01.

Classification: Ordinary chondrite (LL3.15). Subtype based on Cr₂O₃ contents of ferroan olivines per Figure 15 of Grossman and Brearley (2005).

Specimens: 33.5 g including one polished thin section at UWB; remainder with Aaronson.

Bibliography:

Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Temara
Date:	P 2020 Jan
Mass (g):	5000
Pieces:	1
Class:	LL3.15
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	14.2±9.1
Ferrosilite (mol%):	16.4±6.7
Wollastonite (mol%):	1.3±1.4
Magnetic suscept.:	4.01
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	33.5
Type spec location:	UWB
Main mass:	A. Aaronson
Comments:	Work name M2246; 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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 109, in preparation (2020)

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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