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:

Recommended:

L6 [explanation]

This is 1 of 12058 approved meteorites (plus 6 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 Meteoritical Bulletin, no. 110, in preparation (2021)

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8416 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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