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 554 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 Meteoritical Bulletin, no. 110, in preparation (2021)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8420 approved meteorites from (Northwest Africa) (plus 1900 unapproved names)

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