Meteoritical Bulletin: Entry for Northwest Africa 7420

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Northwest Africa 7420

Basic information

Name: Northwest Africa 7420
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7420
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass: 99.8 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	CK5
Recommended:			CK5 [explanation]

This is 1 of 205 approved meteorites classified as CK5. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites

Comments:

Approved 29 Sep 2013

Writeup

Writeup from MB 102:

Northwest Africa 7420 (NWA 7420)

(Northwest Africa)

Purchased: 2012 Feb

Classification: Carbonaceous chondrite (CK5)

History: Purchased in Agadir in Feb. 2012

Physical characteristics: Single stone, fusion crust partly covered by caliche, sawn face shows some chondrules and black inclusions set in a dark gray matrix.

Petrography: Microprobe examination of a thin section shows primarily fine-grained texture with olivine, pyroxene, magnetite, iron oxidation from weathering, and a few poorly developed chondrules up to 1 mm.

Geochemistry: (R. Bartoschewitz, Bart, P. Appel and B. Mader, Kiel) Olivine: Fa_29.6-30.4, mean Fa_30.0±0.3; Fe/Mn=110±26 (n=17); Ca-rich pyroxene: Fs_1.4-9.3En_0-42Wo_48-99(n=8); magnetite: Cr₂O₃=3-4; Al₂O₃=0.3-3.7 wt.% (n=10).

Classification: Carbonaceous chondrite (CK5)

Specimens: 20.6 g on deposit at Kiel, main mass A. Koppelt (München) and 9 g with Bart.

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Agadir
Date:	P 2012 Feb
Mass (g):	99.8
Pieces:	1
Class:	CK5
Shock stage:	S4
Fayalite (mol%):	30.0 (29.6-30.4, n=17)
Magnetic suscept.:	4,87
Classifier:	Bart
Type spec mass (g):	20.58
Type spec location:	Kiel
Main mass:	A. Koppelt
Finder:	anonymous
Comments:	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. 102, MAPS 50, 1662, September 2015

Find references in NASA ADS:
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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
ironee

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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