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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:help 2.3 kg
Classification
  history:
Recommended:  LL3    [explanation]

This is 1 of 369 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
Writeuphelp
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 (Fa16.4±14.1, range Fa1.5-45.8, N = 5; Cr2O3 in ferroan olivine 0.06-0.33 wt.%, mean 0.16 wt.%, sd 0.08 wt.%, N = 18), low-Ca pyroxene (Fs15.1±6.4Wo1.8±1.5, range Fs4.8-24.5Wo0.3-3.3, N = 6), pigeonite (Fs9.4Wo16.5), augite (Fs16.3Wo43.2). 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 1118 approved meteorites from Algeria (plus 27 unapproved names) (plus 4 impact craters)

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