Meteoritical Bulletin: Entry for Northwest Africa 13035

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Northwest Africa 13035

Basic information

Name: Northwest Africa 13035
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13035
Observed fall: No
Year found: 2019
Country: Algeria
Mass: 818 g

Classification
history:

Recommended:

CK4 [explanation]

This is 1 of 121 approved meteorites classified as CK4. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites

Comments:

Approved 9 Feb 2020

Writeup

Writeup from MB 109:

Northwest Africa 13035 (NWA 13035)

Algeria

Find: 2019 May

Classification: Carbonaceous chondrite (CK4)

History: Found by prospectors in the vicinity of Adrar, Algeria, in May 2019.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Relatively closely-packed well-formed, equilibrated chondrules (mostly granular but also PO and BO) are set in a sparse finer grained matrix (~15 vol.%). Both chondrules and matrix contain Cr-magnetite, some of which has minor light orange staining.

Geochemistry: Olivine (Fa_31.8±0.2(range Fa_31.6-31.9, N = 7), orthopyroxene (Fs_26.2±0.2Wo_0.8±0.1(range 26.0-26.4Wo_0.7-0.9, N = 5), augite (Fs_13.8Wo_39.9; Fs_8.2-9.7Wo_46.7-47.1; N = 3), plagioclase (An_35.0Or_3.8), magnetite (Cr₂O₃ 4.1-4.2 wt.%, N = 2).

Classification: Carbonaceous chondrite (CK4).

Specimens: 21 g including one polished thin section at UWB; remainder with anonymous finders.

Data from:
  MB109
  Table 0
  Line 0:

Origin or pseudonym:	Adrar
Date:	2019 May
Mass (g):	818
Pieces:	2
Class:	CK4
Shock stage:	S2
Weathering grade:	low
Fayalite (mol%):	31.8±0.2
Ferrosilite (mol%):	26.2±0.2
Wollastonite (mol%):	0.8±0.1
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	21
Type spec location:	UWB
Main mass:	Anonymous
Comments:	Work names DL 1006&1009; 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. 109, in preparation (2020)

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Geography:

Algeria

Coordinates:

Unknown.

Statistics:
This is 1 of 1270 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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