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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:help 99.5 g
Classification
  history:
Recommended:  H4    [explanation]

This is 1 of 6038 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
Writeuphelp
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 Fa18.5±0.6 (range Fa17.9-20.1; n=16); pyroxene Fs15.8±0.2Wo1.7±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)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7912 approved meteorites from (Northwest Africa) (plus 1974 unapproved names)

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