Meteoritical Bulletin: Entry for Northwest Africa 4899

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Northwest Africa 4899

Basic information

Name: Northwest Africa 4899
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4899
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass: 8 g

Classification
history:

Recommended:

Eucrite [explanation]

This is 1 of 571 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 17 Oct 2021

Writeup

Writeup from MB 110:

Northwest Africa 4899 (NWA 4899)

(Northwest Africa)

Purchased: 2007

Classification: HED achondrite (Eucrite)

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

Physical characteristics: Small grayish fragment without fusion crust.

Petrography: The meteorite is composed of up to 4 mm basaltic clasts set in abundant fine-grained recrystallized groundmass dominated by 10-30 µm sized exsolved pyroxene and calcic plagioclase grains. Some larger up to 100 µm sized plagioclase grains are present. Minor phases are silica, chromite, ilmenite, FeS, and metallic iron.

Geochemistry: low-Ca pyroxene: Fs_58.2±0.3Wo_4.5±0.2(Fs_57.8-58.7Wo_4.3-4.7, FeO/MnO=29-31, n=5); Ca-pyroxene: Fs_26.3±0.1Wo_43.1±0.1(Fs_26.1-26.5Wo_43.0-43.3, FeO/MnO=28-33, n=5); calcic plagioclase: An_90.1±0.5(An_89.5-90.9, n=5)

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Ouarzazate, Morocco
Date:	P 2007
Mass (g):	8
Pieces:	1
Class:	Eucrite
Shock stage:	moderate
Weathering grade:	low
Ferrosilite (mol%):	58.2; 26.3
Wollastonite (mol%):	4.5; 43.1
Classifier:	A. Greshake, MNB
Type spec mass (g):	1.6
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., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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