Meteoritical Bulletin: Entry for Northwest Africa 14172

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Northwest Africa 14172

Basic information

Name: Northwest Africa 14172
This is an OFFICIAL meteorite name.
Abbreviation: NWA 14172
Observed fall: No
Year found: 2020
Country: Mali
Mass: 230 g

Classification
history:

Recommended:

CK5 [explanation]

This is 1 of 192 approved meteorites classified as CK5. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites

Comments:

Approved 6 Oct 2021

Writeup

Writeup from MB 110:

Northwest Africa 14172 (NWA 14172)

Mali

Purchased: 2020 Feb

Classification: Carbonaceous chondrite (CK5)

History: Purchased by Mbark Arjdal in February 2020 from a Malian dealer.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Sparse separated, granular chondrules containing Cr-magnetite are set in a matrix containing Cr-magnetite (stained red-brown in thin section), calcic plagioclase and minor ilmenite

Geochemistry: Olivine (Fa_31.6±0.1, range Fa_31.4-31.8, N = 6), low-Ca pyroxene (Fs_26.1±0.0Wo_2.7±1.6, range Fs_24.5-27.4Wo_1.6-3.8, N = 2), augite (Fs_10.0±0.4Wo_44.6±2.1, range Fs_9.8-10.3Wo_46.1-43.1, N = 2), plagioclase (An_68.9-72.6Or_2.4, N = 2), magnetite (Cr₂O₃ = 4.0-4.3 wt.%, N = 3).

Classification: Carbonaceous chondrite (CK5).

Specimens: 26.1 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Mali
Date:	P 2020 Feb
Mass (g):	230
Pieces:	1
Class:	CK5
Shock stage:	S2
Weathering grade:	low
Fayalite (mol%):	31.6±0.1
Ferrosilite (mol%):	26.1±0.0
Wollastonite (mol%):	2.7±1.6
Classifier:	A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):	26.1
Type spec location:	UWB
Main mass:	M. Arjdal
Comments:	Work name Arj ZM 762; 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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 110, in preparation (2021)

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Geography:

Mali

Coordinates:

Unknown.

Statistics:
This is 1 of 64 approved meteorites from Mali (plus 1 unapproved name)

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