Meteoritical Bulletin: Entry for Northwest Africa 4890

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Northwest Africa 4890

Basic information

Name: Northwest Africa 4890
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4890
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass: 76 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 513 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 12 Mar 2019

Writeup

Writeup from MB 108:

Northwest Africa 4890 (NWA 4890)

(Northwest Africa)

Purchased: 2006

Classification: HED achondrite (Eucrite)

History: The meteorite was purchased in 2006 from a local meteorite dealer in Rissani, Morocco.

Physical characteristics: Grayish fragment partly covered with fusion crust.

Petrography: The meteorite is an unbrecciated basalt predominantly composed of exsolved pyroxenes and calcic plagioclase with highly variable grain sizes ranging from 50 µm to 1.5 mm. Minor phases are silica, chromite, FeS, ilmenite, and metallic Fe.

Geochemistry: low-Ca pyroxene: Fs_57.1±2.8Wo_7.3±3.3(Fs_51.1-60.2Wo_3.9-14.6, n=11, FeO/MnO=29-32); Ca-pyroxene: Fs_32.0±3.9Wo_38.4±4.9(Fs_30.0-44.4Wo_23.1-41.1, n=12, FeO/MnO=29-32); calcic plagioclase: An_88.8±0.6(An_88.2-90.3, n=11)

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Rissani, Morocco
Date:	P 2006
Mass (g):	76
Pieces:	1
Class:	Eucrite
Shock stage:	low
Weathering grade:	low
Ferrosilite (mol%):	57.1; 32.0
Wollastonite (mol%):	7.3; 38.4
Classifier:	A. Greshake, MNB
Type spec mass (g):	15.5
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 Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7885 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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