Meteoritical Bulletin: Entry for Northwest Africa 12497

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Northwest Africa 12497

Basic information

Name: Northwest Africa 12497
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12497
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 99.5 g

Classification
history:

Meteoritical Bulletin:	MB 109	(2020)	H4
Recommended:			H4 [explanation]

This is 1 of 6493 approved meteorites (plus 2 unapproved names) classified as H4. [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 18 Apr 2020

Writeup

Writeup from MB 109:

Northwest Africa 12497 (NWA 12497)

(Northwest Africa)

Purchased: 2018

Classification: Ordinary chondrite (H4)

History: Purchased at Hamburg Mineral Show Dec. 2018.

Physical characteristics: 99.8 g black stone with metallic specks on the surface

Petrography: (R. Bartoschewitz, Bart) fractured matrix with indistinct chondrule relicts. Metal and sulfide penetration into cracks blacken the meteorite.

Geochemistry: (R. Bartoschewitz, Bart, P. Appel and B. Mader, Kiel) Olivine Fa_18.5±0.6(range Fa_17.9-20.1; n=16); pyroxene Fs_15.8±0.2Wo_1.7±0.2(n=5); feldspar An₁₄Or₆(n=1); merrillite. Kamacite Ni=7.7-8.5 wt%, Co=0.6 wt%. Magnetic susceptibility (R. Bartoschewitz, Bart) log χ (× 10^-9 m³/kg) = 5.44

Classification: Ordinary chondrite (H4, S4, W0)

Specimens: 23.9 g on deposit at Kiel, Bart holds the main mass.

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Hamburg
Date:	P 2018
Mass (g):	99.5
Pieces:	1
Class:	H4
Shock stage:	S4
Weathering grade:	W0
Fayalite (mol%):	18.5±0.6 (17.9-20.1; n=16)
Ferrosilite (mol%):	15.8±0.2 (n=5)
Wollastonite (mol%):	1.7±0.2
Magnetic suscept.:	5.44
Classifier:	R. Bartoschewitz
Type spec mass (g):	23.9
Type spec location:	Kiel
Main mass:	Bart
Finder:	anonymous
Comments:	NWA-RB10; 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. 109, in preparation (2020)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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