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:

Meteoritical Bulletin:	MB 109	(2021)	CO3.0
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 Gattacceca J., McCubbin F. M., Grossman J., Bouvier A., Bullock E., Chennaoui Aoudjehane H., Debaille V., D’Orazio M., Komatsu M., Miao B. and Schrader D. L. (2021) The Meteoritical Bulletin, No. 109. Meteoritics & Planetary Science 56, 1626–1630.

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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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