Meteoritical Bulletin: Entry for Northwest Africa 15271

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Northwest Africa 15271

Basic information

Name: Northwest Africa 15271
This is an OFFICIAL meteorite name.
Abbreviation: NWA 15271
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass: 467 g

Classification
history:

Meteoritical Bulletin:	MB 111	(2023)	LL3.15
Recommended:			LL3.15 [explanation]

This is 1 of 23 approved meteorites classified as LL3.15. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 1 Oct 2022

Writeup

help

Writeup from MB 111:

Northwest Africa 15271 (NWA 15271)

(Northwest Africa)

Purchased: 2022

Classification: Ordinary chondrite (LL3.15)

History: Purchased in 2022 by Edwin Thompson from a meteorite dealer in Mauritania. Later purchased by Paul Stahura.

Physical characteristics: Two weathered pieces (240.4 g and 165.6 g) with minor dark-brown fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample is a chondrite composed of well-defined chondrules (Average apparent diameter ~1.1±0.5 mm) containing both primary and devitrified glass, set within a mostly opaque matrix. Accessory phases identified include troilite and kamacite.

Geochemistry: Olivine (Fa_20.1±8.2, range Fa_1.2-39.0, n=59), Cr₂O₃ in ferroan olivine (0.19±0.13 wt%, range 0.06-0.55, n=56), Low-Ca Pyroxene (Fs_12.4±18.6Wo_1.1±1.1, range Fs_1.6-33.5Wo_0.2-5.4, n=36).

Classification: Ordinary Chondrite (LL3.15). LL group suggested from average chondrule diameter; subtype 3.15 estimated due to mean Cr₂O₃ value and standard deviation from ferroan olivines according to (Grossman and Brearley, 2005), similar to Y-791324.

Specimens: 48.75 grams at Cascadia, main mass with Paul Stahura.

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:
  MB111
  Table 0
  Line 0:

Place of purchase:	Mauritania
Date:	P 2022
Mass (g):	466.8
Pieces:	2
Class:	LL3.15
Shock stage:	S2
Weathering grade:	W3
Fayalite (mol%):	20.1±8.2
Ferrosilite (mol%):	12.4±8.6
Wollastonite (mol%):	1.1±1.1
Classifier:	D. Sheikh, Cascadia
Type spec mass (g):	48.75
Type spec location:	Cascadia
Main mass:	Paul Stahura
Comments:	CML 1605; submitted by Daniel Sheikh

Institutions
and collections

Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)

Catalogs:

References:

Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

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Revision
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