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 441 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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4

Find references in NASA ADS:
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Geography:

Algeria

Coordinates:

Unknown.

Statistics:
This is 1 of 1250 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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