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:

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 Meteoritical Bulletin, no. 111, in preparation (2022)

Find references in NASA ADS:
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Photos:

Credit	Photos
Public domain photographs:
Knut Metzler

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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