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Northwest Africa 16731
Basic information Name: Northwest Africa 16731
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16731
Observed fall: No
Year found: 2024
Country: (Northwest Africa)
Mass:help 752 g
Classification
  history:
Recommended:  LL6    [explanation]

This is 1 of 2954 approved meteorites (plus 2 unapproved names) classified as LL6.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 20 May 2024
Writeuphelp
Writeup from MB 113:

Northwest Africa 16731 (NWA 16731)

(Northwest Africa)

Purchased: 2024 Feb

Classification: Ordinary chondrite (LL6)

Physical characteristics: A single stone, broken in two parts, partially covered by fusion crust. Cut surface reveals a light grey interior with black clasts to cm in size.

Petrography: (J. Gattacceca, CEREGE) Brecciated chondrite with highly recrystallized clasts, to cm in size, set in a clastic matrix of the same material. The plagioclase in the clasts is euhedral and has average size ~100 µm. Some clasts are shock-darkened by abundant opaque veinlets and the presence of small metal/troiilte composite grains in the silicates. One relict chondrule was observed in the clastic matrix in the studied polished section.

Geochemistry: Olivine Fa29.8±0.3 (n=5). Orthopyroxene Fs23.2±0.6Wo2.04±0.23 (n=4). Ca-pyroxene Fs10.9Wo42.6 (n=1). Plagioclase An10.4±0.2Ab88.0±0.4Or1.5±0.2 (n=3).

Classification: Ordinary chondrite (LL6, brecciated)

Specimens: Type specimen at CEREGE. Main mass with Kuntz.

Data from:
  MB113
  Table 0
  Line 0:
Place of purchase:Tindouf, Algeria
Date:P 2024 Feb
Mass (g):752
Pieces:1
Class:LL6
Weathering grade:W0/1
Fayalite (mol%):29.8±0.3 (n=5)
Ferrosilite (mol%):23.2±0.6 (n=4)
Wollastonite (mol%):2.03±0.23
Magnetic suscept.:3.91
Classifier:J. Gattacceca, C. Sadaka, CEREGE
Type spec mass (g):26.45
Type spec location:CEREGE
Main mass:Kuntz
Finder:anonymous
Comments:work name K590; submitted by J. Gattacceca, CEREGE
Institutions
   and collections		 CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 10 Jun 2023)
Kuntz: Fabien Kuntz, France; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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