Meteoritical Bulletin: Entry for Northwest Africa 12498

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Northwest Africa 12498

Basic information

Name: Northwest Africa 12498
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12498
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 167.6 g

Classification
history:

Meteoritical Bulletin:	MB 110	(2022)	L6
Recommended:			L6 [explanation]

This is 1 of 12780 approved meteorites (plus 11 unapproved names) classified as L6. [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 18 Jan 2021

Writeup

Writeup from MB 110:

Northwest Africa 12498 (NWA 12498)

(Northwest Africa)

Purchased: 2018

Classification: Ordinary chondrite (L6)

History: Purchased at Hamburg Mineral Show Dec. 2018.

Physical characteristics: 167.6 g dark brown stone with metallic specks on the surface

Petrography: (R. Bartoschewitz, Bart) fractured and blackened matrix with no recognizable chondrules, feldspar >100 µm.

Geochemistry: (R. Bartoschewitz, Bart, P. Appel and B. Mader, Kiel) Olivine Fa_24.7±1.0(n=26); low-Ca pyroxene Fs_21.2±0.6Wo_1.7±0.1(n=3); Ca pyroxene En₄₇Fs₇Wo₄₆(n=1); chromite CRAL=86, FFM=86-92 (n=6); merrillite. Kamacite Ni=6.5-6.9 wt%, Co=1.0-1.2 wt% (n=2). Magnetic susceptibility (R. Bartoschewitz, Bart) log χ (× 10^-9 m³/kg) = 5.06

Classification: Ordinary chondrite (L6, S4, W0), based on texture, Wo content of pyroxenes, plagioclase size, and absence of chondrules

Specimens: 21.0 g at Kiel, Bart holds the main mass.

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Hamburg
Date:	P 2018
Mass (g):	167.6
Pieces:	1
Class:	L6
Shock stage:	S4
Weathering grade:	W0
Fayalite (mol%):	24.7±1.0 (n=26)
Ferrosilite (mol%):	21.2±0.6 (n=3)
Wollastonite (mol%):	1.7±0.1
Magnetic suscept.:	5.06
Classifier:	R. Bartoschewitz
Type spec mass (g):	21.0
Type spec location:	Kiel
Main mass:	Bart
Finder:	anonymous
Comments:	NWA-RB11; submitted by R. Bartoschewitz

Institutions
and collections

Kiel: Geologisches und Mineralogisches Museum, Institut für Geowissenschaften, Christian-Albrechts-Universität Kiel, Ludewig-Mayn-Str. 10, D-24118 Kiel, Germany, Germany (institutional address; updated 13 Sep 2013)
Bart: Bartoschewitz Meteorite Laboratory, Weiland 37, D-38518 Gifhorn, Germany; Website (private address; updated 30 Nov 2019)

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 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

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Revision
history:

This lists important revisions made to data for this record.

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