Meteoritical Bulletin: Entry for Northwest Africa 5474

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Northwest Africa 5474

Basic information

Name: Northwest Africa 5474
This is an OFFICIAL meteorite name.
Abbreviation: NWA 5474
Observed fall: No
Year found: 2008
Country: (Northwest Africa)
Mass: 58 g

Classification
history:

Meteoritical Bulletin:	MB 106	(2018)	Eucrite-pmict
Recommended:			Eucrite-pmict [explanation]

This is 1 of 409 approved meteorites classified as Eucrite-pmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 26 Sep 2017

Writeup

Writeup from MB 106:

Northwest Africa 5474 (NWA 5474)

(Northwest Africa)

Purchased: 2008

Classification: HED achondrite (Eucrite, polymict)

History: The meteorite was bought in 2008 from a Moroccan meteorite dealer in Erfoud, Morocco.

Physical characteristics: Grayish individual lacking any fusion crust.

Petrography: The meteorite is a breccia composed of basaltic, dark impact melt, and mineral clasts set into a fine-grained clastic matrix. Clasts and matrix are dominantly composed of exsolved pyroxene and plagioclase up to 1 mm in size. Minor phases include chromite, fayalite, pyrrhotite, silica, and metallic iron.

Geochemistry: Low-Ca pyroxene: Fs_26.8±1.6Wo_3.4±0.7(Fs_21.5-28.7Wo_2.0-4.2, n=15, FeO/MnO=29-36); Ca-pyroxene: Fs_26.1±1.4Wo_42.4±0.8(Fs_23.8-28.2Wo_40.4-43.0, n=18, FeO/MnO=30-39); calcic plagioclase: An_90.3±3.8(An_79.4-95.8, n=17)

Data from:
  MB106
  Table 0
  Line 0:

Place of purchase:	Erfoud, Morocco
Date:	P 2008
Mass (g):	58
Pieces:	1
Class:	Eucrite-pmict
Shock stage:	moderate
Weathering grade:	low
Ferrosilite (mol%):	26.8; 26.1
Wollastonite (mol%):	3.4; 42.4
Classifier:	A. Greshake, MNB
Type spec mass (g):	11.8
Type spec location:	MNB
Main mass:	Stefan Ralew
Comments:	Submitted by Ansgar Greshake

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)

Catalogs:

References:

Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.

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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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