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:

Recommended:

L6-melt breccia [explanation]

This is 1 of 66 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 Meteoritical Bulletin, no. 110, in preparation (2021)

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8420 approved meteorites from (Northwest Africa) (plus 1900 unapproved names)

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