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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:help 8 g
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 537 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 17 Oct 2021
Writeuphelp
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: Fs58.2±0.3Wo4.5±0.2 (Fs57.8-58.7Wo4.3-4.7, FeO/MnO=29-31, n=5); Ca-pyroxene: Fs26.3±0.1Wo43.1±0.1 (Fs26.1-26.5Wo43.0-43.3, FeO/MnO=28-33, n=5); calcic plagioclase: An90.1±0.5 (An89.5-90.9, 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)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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