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Northwest Africa 13868
Basic information Name: Northwest Africa 13868
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13868
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 880 g
Classification
  history:
Recommended:  LL3    [explanation]

This is 1 of 387 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 20 Dec 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13868 (NWA 13868)

Algeria

Purchased: 2020 May

Classification: Ordinary chondrite (LL3)

History: Purchased by John Higgins in May, 2020 from a dealer in Ouarzazate, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Fairly closely packed, well-formed chondrules (apparent diameter 1030±640 µm, N = 24) are set in a fine grained matrix containing kamacite (almost completely altered to Fe oxide), taenite, troilite and low-Ti chromite.

Geochemistry: Olivine (Fa27.9±20.8, range Fa0.6-58.1, N = 9; Cr2O3 in ferroan olivine 0.02-0.28 wt.%, mean 0.07 wt.%, sd 0.06 wt.%, N = 14), low-Ca pyroxene (Fs19.0±9.3Wo2.7±1.5, range Fs10.3-31.6Wo0.8-4.3, N = 4), pigeonite (Fs32.9Wo6.2; Fs32.3Wo11.6; N = 2), subcalcic augite (Fs29.0Wo22.3; Fs10.5Wo31.8; N = 2). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.22.

Classification: Ordinary chondrite (LL3).

Specimens: 30 g including one polished thin section at UWB; remainder with Mr. J. Higgins.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Ouarzazate
Date:P 2020 May
Mass (g):880
Pieces:1
Class:LL3
Shock stage:S2
Weathering grade:W2/3
Fayalite (mol%):27.9±20.8
Ferrosilite (mol%):19.0±9.3
Wollastonite (mol%):2.7±1.5
Magnetic suscept.:4.22
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):30
Type spec location:UWB
Main mass:J. Higgins
Comments:Work name JH20-9; 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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Photos:
CreditPhotos
Public domain photographs:
A. Irving   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1166 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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