Meteoritical Bulletin: Entry for Northwest Africa 14490

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Northwest Africa 14490

Basic information

Name: Northwest Africa 14490
This is an OFFICIAL meteorite name.
Abbreviation: NWA 14490
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass: 223 g

Classification
history:

Recommended:

LL3 [explanation]

This is 1 of 452 approved meteorites classified as LL3. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 23 Nov 2021

Writeup

Writeup from MB 110:

Northwest Africa 14490 (NWA 14490)

(Northwest Africa)

Purchased: 2021 Jul

Classification: Ordinary chondrite (LL3)

History: Purchased by Shun-Chung Yang in July 2021 from a dealer in Tindouf, Algeria.

Petrography: (A. Irving, UWS and J. Boesenberg, Brown U.) Well-formed chondrules (apparent diameter 940±570 µm, N = 25) are set in a fine grained matrix (~15 vol.%, red-brown in thin section) containing extensively altered kamacite, troilite and chromite, plus some secondary barite and calcite.

Geochemistry: Olivine (Fa_22.5±11.2, range Fa_3.0-40.8, N = 11; Cr₂O₃ in ferroan olivine 0.03-0.12 wt.%, mean 0.07±0.03 wt.%, N = 10), low-Ca pyroxene (Fs_20.9±13.9Wo_1.0±0.8, range Fs_2.0-34.8Wo_0.34-2.3, N = 5), pigeonite (Fs_6.1Wo_10.6). Magnetic susceptibility log χ (× 10^-9 m³/kg) = 3.33.

Classification: Ordinary chondrite (LL3).

Specimens: 21 g including one polished thin section at UWB; remainder with Mr. S.-C. Yang.

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Tindouf
Date:	P 2021 Jul
Mass (g):	223
Pieces:	1
Class:	LL3
Shock stage:	S2
Weathering grade:	W3
Fayalite (mol%):	22.5±11.2
Ferrosilite (mol%):	20.9±13.9
Wollastonite (mol%):	1.0±0.8
Magnetic suscept.:	3.33
Classifier:	A. Irving, UWS, and J. Boesenberg, Brown U.
Type spec mass (g):	21.0
Type spec location:	UWB
Main mass:	S.-C. Yang
Comments:	Work name SCY-45; 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)

Catalogs:

References:

Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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