Meteoritical Bulletin: Entry for Northwest Africa 13729

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Northwest Africa 13729

Basic information

Name: Northwest Africa 13729
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13729
Observed fall: No
Year found: 2019
Country: Algeria
Mass: 2.3 kg

Classification
history:

Recommended:

LL3 [explanation]

This is 1 of 361 approved meteorites classified as LL3. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 21 Feb 2021

Writeup

Writeup from MB 110:

Northwest Africa 13729 (NWA 13729)

Algeria

Purchased: 2019

Classification: Ordinary chondrite (LL3)

History: Purchased by Jesper Grønne in 2019 from a Moroccan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed, closely-packed glass-bearing chondrules (apparent diameter 800 ± 450 µm, N = 25) are set in a fine grained matrix containing stained kamacite, troilite and minor secondary Ca sulfate.

Geochemistry: Olivine (Fa_16.4±14.1, range Fa_1.5-45.8, N = 5; Cr₂O₃ in ferroan olivine 0.06-0.33 wt.%, mean 0.16 wt.%, sd 0.08 wt.%, N = 18), low-Ca pyroxene (Fs_15.1±6.4Wo_1.8±1.5, range Fs_4.8-24.5Wo_0.3-3.3, N = 6), pigeonite (Fs_9.4Wo_16.5), augite (Fs_16.3Wo_43.2). Magnetic susceptibility log χ (× 10^-9 m³/kg)=4.41.

Classification: Ordinary chondrite (LL3). Suggested subtype LL3.3.

Specimens: 20.1 g including one polished thin section at UWB; remainder with Mr. J. Grønne.

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2019
Mass (g):	2300
Pieces:	2
Class:	LL3
Shock stage:	S2
Weathering grade:	W1
Fayalite (mol%):	22.9±11.2
Ferrosilite (mol%):	20.9±3.4
Wollastonite (mol%):	1.9±1.2
Magnetic suscept.:	4.41
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	20.1
Type spec location:	UWB
Main mass:	J. Grønne
Comments:	Work name JG 045; 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. 110, in preparation (2021)

Find references in NASA ADS:
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Geography:

Algeria

Coordinates:

Unknown.

Statistics:
This is 1 of 1073 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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