Meteoritical Bulletin: Entry for Northwest Africa 15493

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Northwest Africa 15493

Basic information

Name: Northwest Africa 15493
This is an OFFICIAL meteorite name.
Abbreviation: NWA 15493
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass: 425 g

Classification
history:

Meteoritical Bulletin:	MB 111	(2023)	LL3.05
Recommended:			LL3.05 [explanation]

This is 1 of 5 approved meteorites classified as LL3.05. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 11 Dec 2022

Writeup

help

Writeup from MB 111:

Northwest Africa 15493 (NWA 15493)

(Northwest Africa)

Purchased: 2020

Classification: Ordinary chondrite (LL3.05)

Petrography: (K. Metzler, IfP) Unequilibrated ordinary chondrite of very low petrologic type, consisting of closely packed chondrules and chondrule fragments. The mean apparent chondrule size is 640±360 µm; n=85). Low amounts of metal (terrestrially oxidized).

Geochemistry: Mineral compositions and geochemistry: The mean olivine composition is Fa_9.9±9.5(Fa_0.7-36.6; n=19); the mean low-Ca pyroxene composition is Fs_12.2±9.9Wo_0.7±0.6(Fs_2.0-35.3Wo_0.2-2.3; n=14). Mean Cr₂O₃ concentration (wt.%) in ferroan olivine (S. Hieronymus, D. Hezel, University of Cologne): 0.49±0.22 (n=148).

Classification: LL3 chondrite, based on metal content, mean apparent chondrule size, and large chemical variation of olivine and pyroxene. Petrologic subtype 3.05, due to the mean concentration/standard deviation of Cr₂O₃ in ferroan olivine, which is similar to EET 90161 (L3.05; Grossman and Brearley, 2005).

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 2020
Mass (g):	425
Pieces:	2
Class:	LL3.05
Shock stage:	C-S1
Weathering grade:	W4
Fayalite (mol%):	9.9±9.5
Ferrosilite (mol%):	12.2±9.9
Wollastonite (mol%):	0.7±0.6
Classifier:	K. Metzler, IfP
Type spec mass (g):	20
Type spec location:	IfP
Main mass:	Gregor Pacer, Bad Bellingen, Germany
Comments:	Submitted by K. Metzler, IfP

Institutions
and collections

IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)

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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Photos:

Credit	Photos
Public domain photographs:
Knut Metzler

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
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