Meteoritical Bulletin: Entry for Northwest Africa 13956

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Northwest Africa 13956

Basic information

Name: Northwest Africa 13956
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13956
Observed fall: No
Year found: 2020
Country: Algeria
Mass: 98.4 g

Classification
history:

Recommended:

CK5 [explanation]

This is 1 of 181 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 29 May 2021

Writeup

Writeup from MB 110:

Northwest Africa 13956 (NWA 13956)

Algeria

Find: 2020

Classification: Carbonaceous chondrite (CK5)

History: Found in Algeria in 2020 and purhased by Ali Salamu in January 2021 from a dealer in Nouadhibou, Mauritania.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Sparse chondrules are present within a recrystallized matrix containing Cr-magnetite and sulfides (troilite and pentlandite, both partly altered to iron oxyhydroxides).

Geochemistry: Olivine (Fa_33.1±0.8, range Fa_32.7-34.5, N = 5), low-Ca pyroxene (Fs_28.4±0.3Wo_1.8±0.3, range Fs_28.2-28.7Wo_1.6-2.1, N = 3), augite (Fs_9.6±0.5Wo_46.4±0.4, range Fs_9.2-9.9Wo_46.1-46.7, N = 2), plagioclase (An_39.4Or_2.5; An_58.5Or_1.2; N = 2), magnetite (Cr₂O₃ = 4.7-5.0 wt.%, N = 3).

Classification: Carbonaceous chondrite (CK5).

Specimens: 24.4 g including one polished thin section at UWB; remainder with Mr. A. Salamu.

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Nouadhibou
Date:	2020
Mass (g):	98.4
Pieces:	1
Class:	CK5
Shock stage:	S2
Weathering grade:	low
Fayalite (mol%):	33.1±0.8
Ferrosilite (mol%):	28.4±0.3
Wollastonite (mol%):	1.8±0.3
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	24.4
Type spec location:	UWB
Main mass:	A. Salamu
Comments:	Work name SAL21-10; 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)

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Geography:

Algeria

Coordinates:

Unknown.

Statistics:
This is 1 of 1133 approved meteorites from Algeria (plus 27 unapproved names) (plus 4 impact craters)

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