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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:help 20.5 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  Eucrite-br
Recommended:  Eucrite-br    [explanation]

This is 1 of 179 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 31 May 2017
Writeuphelp
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: Fs60.5±0.8Wo2.3±0.4 (Fs59.3-61.5Wo1.9-3.4, n=15, FeO/MnO=28-34); Ca-pyroxene: Fs25.4±3.2Wo44.1±0.8 (Fs19.2-28.4Wo43.1-45.7, n=13, FeO/MnO=25-35); calcic plagioclase: An90.6±2.6 (An87.5-95.5, 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.
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7385 approved meteorites from (Northwest Africa) (plus 1955 unapproved names)

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