Meteoritical Bulletin: Entry for Northwest Africa 12499

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Northwest Africa 12499

Basic information

Name: Northwest Africa 12499
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12499
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 103.3 g

Classification
history:

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

This is 1 of 79 approved meteorites classified as L6-melt breccia. [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 18 Jan 2021

Writeup

Writeup from MB 110:

Northwest Africa 12499 (NWA 12499)

(Northwest Africa)

Purchased: 2018

Classification: Ordinary chondrite (L6, melt breccia)

History: Purchased at Hamburg Mineral Show Dec. 2018.

Physical characteristics: 103.3 g black-brown stone

Petrography: (R. Bartoschewitz, Bart) fractured and blackend recrystallized matrix with poorly recognizable chondrules in contact to fine-grained (~10 µm) recrystallized melt. The melt bears single mineral fragments up to 1 mm.

Geochemistry: (R. Bartoschewitz, Bart, P. Appel and B. Mader, Kiel) Olivine Fa_24.0±0.3(n=17); pyroxene Fs_20.2±0.3(n=6), Wo_1.4±0.1; chromite CRAL=82-85, FFM=89-81 (n=2). Kamacite Ni=8.9 wt%, Co=0.7 (n=1). wt%. Magnetic susceptibility (R. Bartoschewitz, Bart) log χ (× 10^-9 m³/kg) = 4.94

Classification: Ordinary chondrite (L6-melt breccia, W0)

Specimens: 20.7 g at Kiel, Bart holds the main mass.

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Hamburg
Date:	P 2018
Mass (g):	103.3
Pieces:	1
Class:	L6-melt breccia
Weathering grade:	W0
Fayalite (mol%):	24.0±0.3 (n=17)
Ferrosilite (mol%):	20.2±0.3 (n=6)
Wollastonite (mol%):	1.4±0.1
Magnetic suscept.:	4.94
Classifier:	R. Bartoschewitz
Type spec mass (g):	20.7
Type spec location:	Kiel
Main mass:	Bart
Finder:	anonymous
Comments:	NWA-RB13; 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)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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