Meteoritical Bulletin: Entry for Northwest Africa 16889

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Northwest Africa 16889

Basic information

Name: Northwest Africa 16889
This is an OFFICIAL meteorite name.
Abbreviation: NWA 16889
Observed fall: No
Year found: 2023
Country: (Northwest Africa)
Mass: 181.1 g

Classification
history:

Recommended:

CK3 [explanation]

This is 1 of 91 approved meteorites classified as CK3. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites

Comments:

Approved 25 Jul 2024

Writeup

Writeup from MB 113:

Northwest Africa 16889 (NWA 16889)

(Northwest Africa)

Find: 2023 Dec

Classification: Carbonaceous chondrite (CK3)

Physical characteristics: Cut surface reveals large chondrules and CAIs set in an abundant brownish matrix.

Petrography: (J. Gattacceca, CEREGE) Chondrite with large chondrules and CAIs to 5 mm set in a relatively coarse abundant matrix. Opaque minerals are magnetite, and less abundant iron sulfides. No metal was observed.

Geochemistry: Olivine Fa_13.3±10.5, range Fa_2.1-34.7, NiO 0.16 wt% (n=13). Low-pyroxene Fs_0.9Wo_3.5(n=1). Magnetite has 2.83 wt% Cr₂O₃. Defocused matrix analyses FeO 29.1 wt%, analytical total 84.5 wt%.

Classification: Carbonaceous chondrite (CK3). CK group based on the Cr₂O₃ content of magnetite (Torrano et al., 2021)

Specimens: Type specimen at CEREGE, main mass with Kuntz.

Bibliography:

Torrano Z. A., Davidson J. and Wadhwa M. (2020) A reclassification of Northwest Africa 2900 from CV3 to CK3 chondrite. Meteorit. Planet. Sci. 55, 2539–2550. (link)

Data from:
  MB113
  Table 0
  Line 0:

Place of purchase:	Tindouf, Algeria
Date:	2023 Dec
Mass (g):	181.12
Pieces:	1
Class:	CK3
Weathering grade:	moderate
Fayalite (mol%):	14.3±10.5 (n=13)
Ferrosilite (mol%):	0.9 (n=1)
Wollastonite (mol%):	3.5
Magnetic suscept.:	4.32
Classifier:	J. Gattacceca, CEREGE
Type spec mass (g):	22.15
Type spec location:	CEREGE
Main mass:	Kuntz
Finder:	anonymous
Comments:	work name K580; submitted by Jerome Gattacceca

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)

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Geography:

Coordinates:

Unknown.

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

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