Meteoritical Bulletin: Entry for Northwest Africa 14074

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Northwest Africa 14074

Basic information

Name: Northwest Africa 14074
This is an OFFICIAL meteorite name.
Abbreviation: NWA 14074
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass: 470 g

Classification
history:

Recommended:

LL3 [explanation]

This is 1 of 409 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 24 Dec 2021

Writeup

help

Writeup from MB 110:

Northwest Africa 14074 (NWA 14074)

(Northwest Africa)

Purchased: 2020 Dec

Classification: Ordinary chondrite (LL3)

History: A lot of 21 identical-appearing, somewhat weathered stones was purchased by Shun-Chung Yang and Juan Chen in December 2020 from dealer in Tindouf, Algeria.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed, very closely packed chondrules (apparent diameter 1060±570 µm, N = 25) are set in a very sparse matrix (opaque in thin section) containing altered kamacite, taenite and troilite.

Geochemistry: Olivine (Fa_22.8±9.8, range Fa_1.4-35.0, N = 10; Cr₂O₃ in ferroan olivine 0.04-0.18 wt.%, mean 0.12±0.05 wt.%, N = 8), low-Ca pyroxene (Fs_16.1±6.1Wo_1.9±1.2, range Fs_7.2-20.7Wo_0.3-3.3, N = 4), pigeonite (Fs_22.3±6.1Wo_6.1±0.7, range Fs_18.0-26.6Wo_6.6-5.6, N = 2), subcalcic augite (Fs_29.8±5.7Wo_31.9±1.2, range Fs_25.8-33.8Wo_32.7-31.0, N = 2). Magnetic susceptibility log χ (× 10^-9 m³/kg) = 4.12.

Classification: Ordinary chondrite (LL3). LL group based on magnetic susceptibility and chondrule size.

Specimens: 20.5 g including one polished thin section at UWB; remainder with Mr. S.-C. Yang and Mr. J. Chen.

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Tindouf
Date:	P 2020 Dec
Mass (g):	470
Pieces:	21
Class:	LL3
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	22.8±9.8
Ferrosilite (mol%):	16.1±6.1
Wollastonite (mol%):	1.9±1.2
Magnetic suscept.:	4.12
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	22.8
Type spec location:	UWB
Main mass:	S.-C. Yang/J. Chen
Comments:	Work name SCY-22; 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)

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8390 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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