Meteoritical Bulletin: Entry for Northwest Africa 13442

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Northwest Africa 13442

Basic information

Name: Northwest Africa 13442
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13442
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass: 127 g

Classification
history:

Recommended:

CO3.0 [explanation]

This is 1 of 22 approved meteorites classified as CO3.0. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites

Comments:

Approved 10 Oct 2020

Writeup

Writeup from MB 109:

Northwest Africa 13442 (NWA 13442)

(Northwest Africa)

Purchased: March 2020

Classification: Carbonaceous chondrite (CO3.0)

History: Purchased in March 2020 by Fabien Kuntz in Zagora.

Physical characteristics: Multiple fragments with fusion crust.

Petrography: (D. Sheikh, FSU) Small chondrules (150±50 µm, ~60 vol.%), isolated mineral fragments, and CAIs set in a mostly opaque matrix (~40 vol.%).

Geochemistry: Olivine (Fa_21.9±16.3, range Fa_0.4-57.3, FeO/MnO = 68±40, n=55), Cr₂O₃ in ferroan olivine (Cr₂O₃ wt% = 0.33±0.14, n=35), Low-Ca Pyroxene (Fs_3.6±4.9Wo_1.2±0.7, range Fs_1.0-18.4Wo_0.4-3.2, n=12).

Classification: Carbonaceous chondrite (CO3.0). Cr₂O₃ content of ferroan olivines suggest a low petrologic subtype similar to Y-81020 (CO3.0) and Colony (3.0) as reported in Grossman and Brearley (2005).

Specimens: 20.04 grams at UCLA; main mass with Kuntz.

Bibliography:

Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Zagora
Date:	P March 2020
Mass (g):	127
Pieces:	many
Class:	CO3.0
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	21.9±16.3 (N=55)
Ferrosilite (mol%):	3.6±4.9 (N=12)
Wollastonite (mol%):	1.2±0.7 (N=12)
Magnetic suscept.:	4.62
Classifier:	D. Sheikh, FSU
Type spec mass (g):	20.04
Type spec location:	UCLA
Main mass:	Fabien Kuntz
Comments:	Submitted by Daniel Sheikh

Institutions
and collections

UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
Kuntz: Fabien Kuntz, France; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 109, in preparation (2020)

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9092 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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