Meteoritical Bulletin: Entry for Northwest Africa 4894

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Northwest Africa 4894

Basic information

Name: Northwest Africa 4894
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4894
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass: 20.5 g

Classification
history:

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

This is 1 of 237 approved meteorites classified as Eucrite-br. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 31 May 2017

Writeup

Writeup from MB 106:

Northwest Africa 4894 (NWA 4894)

(Northwest Africa)

Purchased: 2007

Classification: HED achondrite (Eucrite, brecciated)

History: The meteorite was bought in 2007 from a local meteorite dealer in Zagora, Morocco.

Physical characteristics: Four small individuals partly covered by fusion crust.

Petrography: The meteorite is a breccia composed of basaltic and impact melt fragments up to 4 mm in size set into abundant clastic matrix. Basaltic clasts and matrix are dominated by exsolved pyroxene and calcic plagioclase up to 2 mm in size. Minor phases are silica, ilmenite, FeS, fayalite, and metallic Fe. The meteorite contains rare carbonaceous C1/2 clasts.

Geochemistry: low-Ca pyroxene: Fs_60.5±0.8Wo_2.3±0.4(Fs_59.3-61.5Wo_1.9-3.4, n=15, FeO/MnO=28-34); Ca-pyroxene: Fs_25.4±3.2Wo_44.1±0.8(Fs_19.2-28.4Wo_43.1-45.7, n=13, FeO/MnO=25-35); calcic plagioclase: An_90.6±2.6(An_87.5-95.5, n=14)

Data from:
  MB106
  Table 0
  Line 0:

Place of purchase:	Zagora, Morocco
Date:	P 2007
Mass (g):	20.5
Pieces:	4
Class:	Eucrite-br
Shock stage:	moderate
Weathering grade:	low
Ferrosilite (mol%):	60.5; 25.4
Wollastonite (mol%):	2.3; 44.1
Classifier:	A. Greshake, MNB
Type spec mass (g):	4.1
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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